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WO2024000421A1 - 显示基板以及显示装置 - Google Patents

显示基板以及显示装置 Download PDF

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Publication number
WO2024000421A1
WO2024000421A1 PCT/CN2022/102867 CN2022102867W WO2024000421A1 WO 2024000421 A1 WO2024000421 A1 WO 2024000421A1 CN 2022102867 W CN2022102867 W CN 2022102867W WO 2024000421 A1 WO2024000421 A1 WO 2024000421A1
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WO
WIPO (PCT)
Prior art keywords
light
base substrate
electrode
layer
defining
Prior art date
Application number
PCT/CN2022/102867
Other languages
English (en)
French (fr)
Inventor
王红丽
徐健
白静璐
赵德江
Original Assignee
京东方科技集团股份有限公司
北京京东方技术开发有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 京东方科技集团股份有限公司, 北京京东方技术开发有限公司 filed Critical 京东方科技集团股份有限公司
Priority to PCT/CN2022/102867 priority Critical patent/WO2024000421A1/zh
Priority to EP22948526.3A priority patent/EP4465356A4/en
Priority to KR1020247027518A priority patent/KR20250025588A/ko
Priority to JP2024547899A priority patent/JP2025521386A/ja
Priority to US18/728,017 priority patent/US20250107386A1/en
Priority to CN202280002019.2A priority patent/CN118575271A/zh
Publication of WO2024000421A1 publication Critical patent/WO2024000421A1/zh

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/122—Pixel-defining structures or layers, e.g. banks
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/124—Insulating layers formed between TFT elements and OLED elements
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/131—Interconnections, e.g. wiring lines or terminals
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/805—Electrodes
    • H10K59/8051—Anodes
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/805—Electrodes
    • H10K59/8052—Cathodes
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/875—Arrangements for extracting light from the devices
    • H10K59/879—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K77/00—Constructional details of devices covered by this subclass and not covered by groups H10K10/80, H10K30/80, H10K50/80 or H10K59/80
    • H10K77/10—Substrates, e.g. flexible substrates
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2101/00—Properties of the organic materials covered by group H10K85/00
    • H10K2101/20—Delayed fluorescence emission
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H10K71/10—Deposition of organic active material
    • H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
    • H10K71/13—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing
    • H10K71/135—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing using ink-jet printing

Definitions

  • Embodiments of the present disclosure relate to a display substrate and a display device.
  • Embodiments of the present disclosure provide a display substrate and a display device.
  • Embodiments of the present disclosure provide a display substrate including a base substrate, a plurality of light-emitting elements and a pixel defining pattern located on the base substrate.
  • the light-emitting element includes a light-emitting functional layer and a first electrode and a second electrode located on both sides of the light-emitting functional layer in a direction perpendicular to the base substrate.
  • the first electrode is located between the light-emitting functional layer and the between the base substrate;
  • the pixel defining pattern is located on the side of the first electrode away from the base substrate, the pixel defining pattern includes a plurality of openings and a defining portion surrounding the plurality of openings, and the light-emitting element is at least partially located in said opening.
  • a surface of the portion of the light conversion layer located within the opening that is away from the base substrate is closer to the surface than at least a portion of the defining portion that is away from the base substrate.
  • the central portion of the portion of the light conversion layer located within the opening that is away from the surface of the base substrate is closer to the base substrate than the edge portion.
  • the light conversion layer includes quantum dots.
  • the first insulating layer includes at least two film layers, and the thickness difference of different film layers is less than 1 micron.
  • the plurality of light-emitting elements include light-emitting elements of at least two colors, and the defining portion located between corresponding openings of adjacent light-emitting elements of different colors includes a first sub-limiting portion located adjacent to the corresponding openings of the light-emitting elements of different colors.
  • the limiting portion between adjacent openings corresponding to light-emitting elements of the same color includes a second sub-defining portion, the maximum thickness of the first sub-defining portion is greater than the maximum thickness of the second sub-defining portion, and/or,
  • a side surface of the first sub-defining portion away from the base substrate includes a first slope, a side surface of the second sub-defining portion away from the base substrate includes a second slope, and the first slope is The slope angle is greater than the slope angle of the second slope; the portion of the second electrode covering the second sub-defining portion is continuously provided.
  • the display substrate further includes: a signal transmission line located on a side of the first electrode facing the base substrate; and a transmission portion located on a side of the first electrode facing the base substrate. , and is electrically connected to the signal transmission line.
  • the display substrate includes a display area and a peripheral area surrounding the display area, the signal transmission line is located in the peripheral area, and the transmission part is located on a side of the edge part of the limiting part close to the display area, And the second electrode is electrically connected to the transmission part.
  • the display substrate further includes: an electrode overlap portion located on a side of the limiting portion facing the base substrate and in a direction perpendicular to the base substrate, the limiting portion and The electrode overlaps overlap.
  • the limiting portion includes an opening or a slot that exposes the electrode overlap portion, and the second electrode is electrically connected to the electrode overlap portion through the opening or the slot.
  • the ratio of the maximum thickness of the defining portion between light-emitting elements with different emitting colors to the maximum thickness of the defining portion between light-emitting elements with the same emitting color is 0.8 ⁇ 1.
  • At least part of the electrode overlapping part extends in the same direction as at least part of the limiting part.
  • the display substrate further includes: a signal transmission line located on a side of the first electrode facing the base substrate.
  • the display substrate includes a display area and a peripheral area surrounding the display area, the signal transmission line is located in the peripheral area, and the second electrode is electrically connected to the signal transmission line through the electrode overlap portion.
  • the electrode overlap portion includes at least one film layer disposed on the same layer as the first electrode.
  • the electrode overlap portion includes multiple film layers, and the distance between the surface of the electrode overlap portion away from the base substrate and the base substrate is greater than the distance between the surface of the electrode overlap portion and the base substrate. The distance between the surface of the first electrode away from the base substrate and the base substrate.
  • the display substrate further includes: a flat layer located between the first electrode and the base substrate.
  • the flat layer includes a flat layer protrusion, and an orthographic projection of the flat layer protrusion on the base substrate overlaps an orthographic projection of the electrode overlap portion on the base substrate so that the The distance between the surface of the electrode overlap portion away from the base substrate and the base substrate is greater than the distance between the surface of the first electrode away from the base substrate and the base substrate. distance.
  • the display substrate further includes: a transparent compensation structure located between the light conversion layer and the bottom of the groove.
  • the side walls of the groove are inclined, and the portion of the side wall that is away from the base substrate is further away from the portion provided in the groove than the portion that is close to the base substrate.
  • the center of the light-emitting area of the light-emitting element is inclined, and the portion of the side wall that is away from the base substrate is further away from the portion provided in the groove than the portion that is close to the base substrate.
  • the defining portion includes the opening
  • the plurality of light-emitting elements includes at least two different-color light-emitting elements
  • the spacing between the light-emitting areas of adjacent different-color light-emitting elements is the same as that of adjacent light-emitting elements.
  • the openings are provided at at least the largest intervals among the intervals between the color light-emitting elements.
  • the display substrate further includes: an isolation structure located between the second electrode and the defining portion.
  • the isolation structure overlaps the limiting portion, and the materials of the isolation structure and the limiting portion are different; along the arrangement direction of adjacent light-emitting elements, the adjacent light-emitting elements are located on the adjacent In the isolation structure between the light-emitting elements, an edge of the isolation structure protrudes relative to an edge of the defining portion to form a protrusion.
  • the display substrate further includes: a spacer located at least partially on a surface of the defining portion away from the side of the base substrate.
  • the limiting part includes a first limiting part and a second limiting part that are stacked, and the first limiting part is located on a side of the second limiting part close to the base substrate, so A surface of the light conversion layer close to the base substrate is closer to the base substrate than at least a portion of a surface of the second defining portion away from the base substrate.
  • the first defining part and the second defining part are in direct contact; or the display substrate further includes a first insulating layer located between the light conversion layer and the second electrode. space, wherein the first insulating layer is disposed between the first limiting part and the second limiting part.
  • the cross section of the limiting portion is taken by a plane connecting the centers of the light-emitting areas of two adjacent light-emitting elements located on both sides of the limiting portion.
  • the cross-section of the limiting portion includes a trapezoid. Or in a stepped shape, the plane is perpendicular to the base substrate.
  • the cross section of the limiting portion taken by a plane connecting the centers of the light-emitting areas of two adjacent light-emitting elements located on both sides thereof is the limiting portion cross-section, and the middle portion of the limiting portion cross-section is
  • the dimension parallel to the direction of the base substrate is larger or smaller than the dimension of the two side parts parallel to the direction of the base substrate, and the plane is perpendicular to the base substrate.
  • the defining portion includes at least two layers of structures arranged in a stack.
  • the light-emitting functional layer includes a thermally activated delayed fluorescent material.
  • the plurality of light-emitting elements includes at least two colors of light-emitting elements, and the light-emitting functional layers of the at least two colors of light-emitting elements are configured to emit light of a first color, and the At least one of the light-emitting elements of at least two colors includes the light conversion layer, and the first color light is converted into the second color light after passing through the light conversion layer.
  • the display substrate further includes: a second insulating layer located on a side of the light conversion layer away from the base substrate; and a color filter layer located on the second insulating layer away from the light conversion layer. side of the layer.
  • the second insulating layer includes refractive particles.
  • Embodiments of the present disclosure provide a display substrate, including a base substrate and a plurality of light-emitting elements and pixel defining patterns located on the base substrate.
  • the light-emitting element includes a light-emitting functional layer and a first electrode and a second electrode located on both sides of the light-emitting functional layer in a direction perpendicular to the base substrate.
  • the first electrode is located between the light-emitting functional layer and the between the base substrate;
  • the pixel defining pattern is located on the side of the first electrode away from the base substrate, the pixel defining pattern includes a plurality of openings and a defining portion surrounding the plurality of openings, and the light-emitting element is at least partially located in said opening.
  • At least one light-emitting element further includes a light conversion layer configured such that light of one color is incident on the light conversion layer and light of another color is emitted, and the light conversion layer is located away from the first electrode. one side of the second electrode.
  • the light conversion layer is disposed on the side of the first electrode away from the second electrode, which can minimize the distance between the light conversion layer and the light-emitting functional layer, thereby improving the light conversion layer's effect on the display substrate. Conversion efficiency of incident light.
  • An embodiment of the present disclosure provides a display device, including the display substrate described in any of the above embodiments and an opposing substrate disposed opposite to the display substrate.
  • the opposite substrate is located on the display side of the display substrate.
  • a material layer provided at a position directly facing the light conversion layer on a side of the opposite substrate facing the display substrate includes the same material as a material in the light conversion layer.
  • 1A is a partial planar structural diagram of a display substrate provided according to an example of an embodiment of the present disclosure.
  • FIG. 1B is a partial planar structural diagram of a display substrate provided according to an example of an embodiment of the present disclosure.
  • Figure 2 is a partial cross-sectional structural diagram taken along AA' shown in Figure 1A.
  • FIG. 3 is a partial cross-sectional structural diagram taken along line BB’ shown in FIG. 1A according to an example of an embodiment of the present disclosure.
  • Figure 4A is a partial cross-sectional structural diagram taken along CC' shown in Figure 1A.
  • Figure 4B is a partial cross-sectional structural diagram taken along C1C1' shown in Figure 1B.
  • FIG. 5 is a partial cross-sectional structural diagram taken along line DD’ shown in FIG. 1A according to another example of an embodiment of the present disclosure.
  • FIG. 6 is a partial planar structural diagram of a display substrate according to another example of an embodiment of the present disclosure.
  • Figure 7 is a partial cross-sectional structural diagram taken along line EE' shown in Figure 6.
  • Figure 8A is a partial cross-sectional structural schematic diagram taken along line FF' shown in Figure 6.
  • FIG. 8B is a partially enlarged view of the F1 region shown in FIG. 8A .
  • Figure 9 is a partial cross-sectional structural diagram taken along line EE' shown in Figure 6 according to another example of an embodiment of the present disclosure.
  • FIG. 10 is a schematic partial cross-sectional structural diagram taken along line EE’ shown in FIG. 6 according to another example of an embodiment of the present disclosure.
  • Figure 11 is a partial cross-sectional structural schematic diagram taken along line EE' shown in Figure 6 according to another example of an embodiment of the present disclosure.
  • Figure 12 is a partial cross-sectional structural diagram taken along line EE' shown in Figure 6 according to another example of an embodiment of the present disclosure.
  • Figure 13 is a partial cross-sectional structural diagram taken along line EE' shown in Figure 6 according to another example of an embodiment of the present disclosure.
  • 14 and 15 are partial cross-sectional structural schematic diagrams taken along line EE' shown in FIG. 6 according to different examples of embodiments of the present disclosure.
  • 16 to 17B are partial planar structural diagrams of a display substrate provided according to different examples of embodiments of the present disclosure.
  • FIG. 18 is a schematic partial cross-sectional structural diagram taken along line AA' shown in FIG. 1A in another example according to an embodiment of the present disclosure.
  • FIG. 19 is a schematic partial cross-sectional structural diagram taken along line AA' shown in FIG. 1A in another example according to an embodiment of the present disclosure.
  • FIG. 20 is a schematic partial cross-sectional structural diagram taken along line AA' shown in FIG. 1A in another example according to an embodiment of the present disclosure.
  • FIG. 21 is a schematic partial cross-sectional structural diagram taken along line AA' shown in FIG. 1A in another example according to an embodiment of the present disclosure.
  • 22 to 26 are partial cross-sectional structural diagrams of the defining portion in the display substrate provided by different examples.
  • FIG. 27 is a partial cross-sectional structural schematic diagram taken along line AA' shown in FIG. 1A in another example according to an embodiment of the present disclosure.
  • FIG. 28 is a schematic partial cross-sectional structural diagram taken along line AA' shown in FIG. 1A in another example according to an embodiment of the present disclosure.
  • Figure 29 is a display substrate provided according to another embodiment of the present disclosure.
  • FIG. 30 is a schematic partial cross-sectional structural diagram of a display device according to another embodiment of the present disclosure.
  • Characteristics such as “parallel”, “perpendicular” and “identical” used in the embodiments of the present disclosure include “parallel”, “perpendicular”, “identical” and other characteristics in the strict sense, as well as “approximately parallel”, “approximately perpendicular”, “Substantially the same” and the like, including certain errors, mean what is acceptable for a particular value as determined by one of ordinary skill in the art, taking into account the errors in the measurement and associated with the measurement of the particular quantity (e.g., limitations of the measurement system). within the deviation range. For example, “approximately” can mean within one or more standard deviations, or within 10% or 5% of the stated value.
  • the component can be one or more, or it can be understood as at least one.
  • At least one means one or more, and “plurality” means at least two.
  • “Same layer” in the embodiment of the present disclosure refers to the relationship between multiple film layers formed of the same material after going through the same step (such as a one-step patterning process). "Same layer” here does not always mean that the thickness of multiple film layers is the same or that the height of the multiple film layers in the cross-sectional view is the same.
  • Embodiments of the present disclosure provide a display substrate and a display device.
  • the display device includes a base substrate and a plurality of light emitting elements and pixel defining patterns located on the base substrate.
  • the light-emitting element includes a light-emitting functional layer and a first electrode and a second electrode located on both sides of the light-emitting functional layer in a direction perpendicular to the base substrate.
  • the first electrode is located between the light-emitting functional layer and the base substrate; the pixel defining pattern is located on the first The electrode is away from the side of the base substrate, the pixel defining pattern includes a plurality of openings and a defining portion surrounding the plurality of openings, and the light-emitting element is at least partially located in the opening.
  • At least one light-emitting element further includes a light conversion layer, the light conversion layer is configured such that light of one color is incident on the light conversion layer and light of another color is emitted, the light conversion layer is located on a side of the second electrode away from the base substrate, and At least a portion of the light conversion layer is located within the opening, and the portion of the light conversion layer located within the opening is closer to a surface of the base substrate than at least a portion of a surface of the defining portion that is away from the base substrate.
  • the portion of the light conversion layer located in the opening is arranged closer to the surface of the base substrate than the surface of at least part of the defining portion that is away from the base substrate, which can minimize light conversion.
  • the distance between the layer and the light-emitting functional layer is to improve the conversion efficiency of the light conversion layer to incident light.
  • FIG. 1A is a partial plan structural schematic diagram of a display substrate provided according to an example of an embodiment of the present disclosure.
  • FIG. 2 is a partial cross-sectional structural schematic diagram taken along AA' shown in FIG. 1A .
  • the display substrate includes a base substrate 100 and a plurality of light emitting elements 200 and a pixel defining pattern 300 located on the base substrate 100 .
  • the light-emitting element 200 includes a light-emitting functional layer 230 and a first electrode 210 and a second electrode 220 located on both sides of the light-emitting functional layer in a direction perpendicular to the base substrate 100.
  • the first electrode 210 is located between the light-emitting functional layer 230 and the base substrate 100. between.
  • the direction perpendicular to the base substrate 100 refers to the direction perpendicular to the main surface of the base substrate 100 on which the light-emitting element 200 is disposed, such as the Z direction shown in FIG. 2 .
  • the pixel defining pattern 300 is located on a side of the first electrode 210 away from the base substrate 100 .
  • the pixel defining pattern 300 includes a plurality of openings 310 and a defining portion 320 surrounding the plurality of openings 310 .
  • the light emitting element 200 Located at least partially in opening 310.
  • the limiting part 320 may be formed of a transparent material or a black material.
  • the above-mentioned light-emitting element is at least partially located in the opening means that at least part of each light-emitting element is located in the opening.
  • At least one light-emitting element 200 further includes a light conversion layer 240 .
  • the light conversion layer 240 is configured such that light of one color is incident on the light conversion layer 240 and then light of another color is emitted.
  • the light conversion layer 240 is located on the side of the second electrode 220 away from the base substrate 100, and at least part of the light conversion layer 240 is located in the opening 310, and the part of the light conversion layer 240 located in the opening 310 is closer to the surface of the base substrate 100 than the defining portion 320 At least part of the surface away from the base substrate 100 is closer to the base substrate 100 .
  • the surface of the light conversion layer close to the base substrate is disposed closer to the base substrate than the surface of at least part of the defining portion away from the base substrate, which can minimize the interaction between the light conversion layer and the light-emitting functional layer. distance to improve the conversion efficiency of the light conversion layer to incident light.
  • 1A only schematically shows the pixel defining pattern and the outline of the light-emitting element defined by the openings of the pixel defining pattern, and does not specifically show the film layers on the side of the pixel defining pattern away from the base substrate and the film layers in the light-emitting element.
  • the surface of the limiting part far away from the base substrate refers to the surface of the limiting part farthest from the base substrate. This surface may be a plane or an arc surface, and this surface does not include the side surfaces of the limiting part.
  • the light conversion layer in the display substrate provided by the present disclosure is not a whole film layer, but a film layer located within the openings of the pixel defining pattern.
  • the embodiments of the present disclosure are not limited thereto.
  • the light conversion layer may also include a portion located in the surface of a partial defining portion (such as the second sub-defining portion described later) away from the substrate. , but the light conversion layers of light-emitting elements of different colors are spaced apart and have no contact.
  • the limiting portion 320 may be an integrated structure in a direction perpendicular to the base substrate 100 .
  • the defining portion 320 includes only one layer of structure.
  • the defining portion 320 may include a portion located between the light-emitting elements 200 that emit light of the same color and a portion located between the light-emitting elements 200 that emit light of different colors. At least a portion of the above-mentioned defining portion 320 may refer to a portion located between the light-emitting elements 200 that emit light of different colors. The portion between the light-emitting elements 200 may also refer to the portion between the light-emitting elements 200 that emit light of the same color, or the defining portion 320 at each position.
  • a plane parallel to the base substrate 100 passes through at least part of the defining portion 320 and the light conversion layer 240 .
  • the light conversion layer 240 and at least part of the defining portion 320 are overlapped in a direction parallel to the base substrate 100 .
  • the orthographic projection of the light conversion layer 240 on a plane perpendicular to the base substrate 100 overlaps the orthographic projection of at least part of the defining portion 320 on that plane.
  • the light-emitting element 200 may be an organic light-emitting diode.
  • the light-emitting element 200 may be an organic light-emitting element.
  • the light emitting element 200 may be an electroluminescent element.
  • the light-emitting element 200 may correspond to a sub-pixel on the display substrate.
  • one sub-pixel includes one light-emitting element, or one sub-pixel includes two or more light-emitting elements.
  • the light-emitting functional layer 230 includes multiple film layers.
  • the multiple film layers may include a hole injection layer (HIL), a hole transport layer (HTL), a light-emitting layer (EL), an electron transport layer (ETL), and an electron injection layer. layer (EIL) and other film layers.
  • the light-emitting functional layer 230 may also include a hole blocking layer (HBL), an electron blocking layer (EBL), a microcavity adjustment layer, an exciton adjustment layer or other functional film layers.
  • the hole injection layer and the hole transport layer are located between the light emitting layer and the first electrode 210
  • the electron transport layer and the electron injection layer are located between the light emitting layer and the second electrode 220 .
  • the hole blocking layer is located between the light emitting layer and the second electrode 220 .
  • the electron blocking layer is located between the light emitting layer and the first electrode 210 .
  • the light-emitting functional layer may also include a plurality of stacked devices.
  • the first stacked layer may include a first light-emitting layer
  • the second stacked layer may include a second light-emitting layer
  • the first stacked layer and the second stacked layer may further include holes.
  • a charge generation layer may be included between the first stack layer and the second stack layer, and the charge generation layer (CGL) may include an n-doped charge generation layer ( CGL), and/or p-doped charge generation layer (CGL).
  • the luminescent functional layer may also include three or more stacked layers.
  • the plurality of light-emitting elements 200 include some light-emitting elements 200 that emit light of the same color and some light-emitting elements 200 that emit light of different colors.
  • the light-emitting elements 200 that emit light of the same color and the light-emitting elements 200 that emit light of different colors can share a second electrode. 220 and the light-emitting functional layer 230.
  • the light-emitting functional layer 230 can be a common layer, and the second electrode 220 can also be a common layer.
  • the light-emitting functional layer 230 of the light-emitting element 200 that emits light of different colors is configured to emit light of the same color.
  • the plurality of light-emitting elements 200 include a red light-emitting element 201 configured to emit red light, a green light-emitting element 202 configured to emit green light, and a blue light-emitting element 203 configured to emit blue light.
  • the light-emitting functional layer of the red light-emitting element 201, the light-emitting functional layer of the green light-emitting element 202, and the light-emitting functional layer of the blue light-emitting element 203 all emit light of the same color.
  • each light-emitting element 200 may include multiple light-emitting layers, such as multiple light-emitting layers that emit blue light of the same wavelength band, or emit blue light of different wavelength bands (such as dark blue light and light blue light).
  • multiple light-emitting layers such as multiple light-emitting layers that emit blue light of the same wavelength band, or emit blue light of different wavelength bands (such as dark blue light and light blue light).
  • the light-emitting functional layer 230 may include three blue light-emitting layers and one green light-emitting layer, and the green light-emitting layer is located on a side of the three blue light-emitting layers away from the base substrate.
  • an electron transport layer, a charge generation layer, and a hole transport layer that are stacked in sequence can be disposed between two adjacent blue light emitting layers.
  • an electron transport layer, a charge generation layer, and a hole transport layer that are stacked in sequence may be disposed between the blue light emitting layer and the green light emitting layer.
  • platinum (Pt) can be doped in the green light-emitting layer.
  • the charge generation layer located between the electron transport layer and the hole transport layer may include an n-type charge generation layer and a p-type charge generation layer, and a functional layer may be added between the n-type charge generation layer and the p-type charge generation layer to adjust Carrier transfer efficiency.
  • the light-emitting functional layer 230 includes a thermally activated delayed fluorescence (TADF) material to improve the luminous efficiency of the light-emitting functional layer and reduce the number of stacked layers of the light-emitting layer, thereby reducing power consumption.
  • TADF thermally activated delayed fluorescence
  • the thickness of the electron transport layer may be 1 to 10 nanometers, such as 2 to 8 nanometers, such as 3 to 7 nanometers.
  • the thickness of the electron injection layer may be 5-30 nanometers, such as 22-28 nanometers, such as 25-27 nanometers, such as 5-15 nanometers, such as 6-12 nanometers.
  • the first electrode 210 may be an anode
  • the second electrode 220 may be a cathode
  • the cathode may be formed from a material with high conductivity and low work function.
  • the cathode may be made of a metallic material.
  • the anode may be formed from a conductive material with a high work function.
  • the first electrode 210 and the second electrode 220 may include multiple film layers.
  • the first electrode 210 may include three film layers, namely a first electrode layer, a second electrode layer, and a third electrode layer.
  • the first electrode 210 includes a stack of tungsten oxide (WO x ) and aluminum (Al).
  • the material of the first electrode layer and the third electrode layer may include tungsten oxide (WO x ), and the material of the second electrode layer may include aluminum (Al).
  • the first electrode 210 includes a three-layer stack of indium tin oxide (ITO), silver (Ag), and indium tin oxide (ITO).
  • the first electrode 210 includes two stacks of indium tin oxide (ITO) and silver (Ag).
  • the first electrode 210 includes indium tin oxide (ITO), silver (Ag), and other metal oxide layers (eg, WO x ).
  • the first electrode includes two or three stacked layers, at least two of which are connected through via holes.
  • the first electrode may include a One sub-layer, insulating layer, second sub-layer.
  • the first electrode may include a first sub-layer, an insulating layer, a second sub-layer, and a third sub-layer on a side of the second sub-layer away from the insulating layer.
  • the first electrode respectively includes a first sub-layer, a second sub-layer, and a third sub-layer in a direction from a side close to the light-emitting layer to a side away from the light-emitting layer.
  • the first sub-layer, the second sub-layer and the third sub-layer are connected through the insulating layer via hole, that is, the first electrode may include the first sub-layer, the second sub-layer, the insulating layer and the third sub-layer.
  • the second electrode 220 may include one or two film layers.
  • the second electrode 220 may include magnesium silver alloy.
  • the second electrode 220 may include a first electrode layer and a second electrode layer, wherein the first electrode layer is located on a side of the second electrode layer close to the light-emitting layer.
  • the second electrode 220 may include a stack of indium oxide ( InOx ) and silver (Ag) or a silver alloy.
  • the material of the first electrode layer may include indium oxide ( InOx ), and the material of the second electrode layer may include silver (Ag) or a silver alloy.
  • the first electrode 210 is a reflective electrode
  • the second electrode 220 is a light-transmitting electrode.
  • the light emitted by the light-emitting functional layer 230 can emerge from the side of the second electrode 220 away from the first electrode 210 and pass through the light conversion layer 240 to be converted into light of another color.
  • the defining portion 320 of the pixel defining pattern 300 is a structure defining the opening 310 .
  • the material of the defining portion 320 may include polyimide, acrylic, polyethylene terephthalate, or the like.
  • the defining portions 320 are intersected to define the opening 310 .
  • the opening 310 of the pixel defining pattern 300 is configured to define a light emitting area of the light emitting element 200 .
  • multiple light-emitting elements 200 may be arranged in one-to-one correspondence with multiple openings 310 .
  • the light emitting element 200 may include a portion located in the opening 310 and a portion overlapping the defining portion 320 in a direction perpendicular to the base substrate 100 .
  • the light emitting element 200 is located in the opening 310 .
  • the first electrode 210 of the light-emitting element is located on the side of the defining portion 320 close to the base substrate 100 , and the opening 310 is configured to expose the first electrode 210 , and the exposed first electrode 210 is at least partially connected to the light-emitting functional layer 230 in the light-emitting element 200 . touch.
  • at least part of the first electrode 210 is located between the defining portion 320 and the base substrate 01 .
  • the first electrode 210 and the second electrode 220 located on both sides of the light-emitting functional layer 230 can drive the light-emitting functional layer 230 in the opening 310 of the pixel defining pattern 300.
  • Make a glow
  • the above-mentioned light-emitting area may refer to an effective light-emitting area of the light-emitting element
  • the shape of the light-emitting area refers to a two-dimensional shape.
  • the shape of the light-emitting area may be the same as the shape of the opening 310 of the pixel defining pattern 300 .
  • the opening of the pixel defining pattern 300 may have a shape with a smaller size on a side closer to the base substrate and a larger size on a side farther from the base substrate.
  • the shape of the light emitting area may be substantially the same as the size and shape of the opening of the pixel defining pattern 300 close to the side of the base substrate.
  • At least part of the opening 310 defined by the defining portion 320 is used to define the light exit area of the light conversion layer 240 .
  • the plurality of light-emitting elements 200 includes at least two-color light-emitting elements 200 , such as a first light-emitting element 201 and a second light-emitting element 202 .
  • the at least two-color light-emitting elements 200 The light-emitting functional layers 230 are configured to emit light of the first color.
  • At least one of the light-emitting elements 200 of at least two colors includes a light conversion layer 240, and the first color light is converted after passing through the light conversion layer 240. is the second color light.
  • the wavelength of the first color light is smaller than the wavelength of the second color light.
  • the area of the light-emitting area of different color light-emitting elements is different.
  • the area of the light-emitting area of the blue light-emitting element may be larger than the area of the light-emitting area of at least one of the red light-emitting element and the green light-emitting element.
  • one of the first light-emitting element 201 and the second light-emitting element 202 can be a blue light-emitting element, a green light-emitting element or a red light-emitting element, and the other of the first light-emitting element 201 and the second light-emitting element 202 can be a green light-emitting element, Red light-emitting element or blue light-emitting element.
  • the first color light may be blue light
  • the second color light may be red light or green light
  • At least two light-emitting elements 200 that emit light of different colors include a light conversion layer 240 .
  • both the red light-emitting element and the green light-emitting element may include the light conversion layer 240.
  • one of the first light-emitting element 201 and the second light-emitting element 202 is a red light-emitting element, and the other is a green light-emitting element.
  • the light conversion layer 240 of the red light-emitting element converts blue light into red light
  • the light conversion layer 240 of the green light-emitting element converts blue light into green light.
  • the third light-emitting element 203 is a blue light-emitting element.
  • the third light-emitting element 203 includes a light-transmitting functional layer 250 and is configured to transmit the first color light emitted from the light-emitting functional layer 230 , such as blue light.
  • the light-transmitting functional layer 250 may include scattering particles or refractive particles to increase the light extraction rate.
  • the portion of the light-transmitting functional layer 250 located within the opening 310 is closer to the surface of the base substrate 100 than at least a portion of the surface of the defining portion 320 that is away from the base substrate 100 .
  • the orthographic projection of the light-transmitting functional layer 250 on a plane perpendicular to the base substrate 100 overlaps with the orthographic projection of at least part of the defining portion 320 on this plane.
  • a plane parallel to the base substrate 100 passes through at least part of the defining portion 320 and the light-transmitting functional layer 250 .
  • light conversion layer 240 includes quantum dots. Embodiments of the present disclosure are not limited thereto, and the light conversion layer may also include fluorescent materials. For example, when incident light of the first color is incident on the light conversion layer 240, the material of the light conversion layer 240 is excited by the incident light of the first color and emits light of other colors, such as light of the second color.
  • the portion of the surface of the light-transmitting functional layer 250 located in the opening 310 that is away from the base substrate 100 is closer to the base substrate 100 than at least a portion of the surface of the defining portion 320 that is away from the base substrate 100 .
  • the light-transmitting functional layer 250 may be completely located within the opening 310 defined by at least the defining portion 320 .
  • the surface of the light conversion layer 240 close to the base substrate 100 may be a flat surface.
  • the surface of the light-transmitting functional layer 250 close to the base substrate 100 may be a flat surface.
  • the surface of the light conversion layer 240 in the light-emitting element 200 that emits light of different colors close to the base substrate 100 may be located on the same surface.
  • the surface of the light conversion layer 240 close to the base substrate 100 and the surface of the light-transmitting functional layer 250 close to the base substrate 100 may be located on the same surface.
  • the central portion of the surface of the light conversion layer 240 located within the opening 310 that is away from the base substrate 100 is closer to the base substrate 100 than the edge portion.
  • the surface of the part of the light conversion layer 240 located in the opening 310 on the side away from the base substrate is a recessed surface, and the highest point at the edge of the recessed surface is larger than the surface on the side away from the base substrate 100 of the defining portion 320 closer to the base substrate 100 .
  • the central portion of the surface of the light-transmitting functional layer 250 located in the opening 310 away from the base substrate 100 is closer to the base substrate 100 than the edge portion.
  • the surface of the portion of the light-transmitting functional layer 250 located in the opening 310 away from the base substrate 100 may be a surface that is recessed toward the base substrate 100 .
  • the surface of the part of the light conversion layer located in the opening that is far away from the base substrate may be further away from the base substrate than the surface of the defining part that is far away from the base substrate, or the light conversion layer is located in the opening.
  • a portion of the surface of the inner portion on the side away from the base substrate may be flush with the surface of the defining portion on the side away from the base substrate.
  • the light conversion layer 240 in each light-emitting element 200 is located in the corresponding opening of the light-emitting element 200 .
  • the light conversion layers 240 of adjacent light-emitting elements 200 with different emitting colors are separated from each other.
  • the distance between the light conversion layers 240 of adjacent light-emitting elements 200 with different emitting colors is greater than the width of the defining portion 320 .
  • the light-transmitting functional layer 250 and the light conversion layer 240 are separated from each other.
  • the minimum thickness of the light conversion layer 240 of the light-emitting element 200 that emits light of different colors may be the same or different.
  • the minimum thickness of the light conversion layer 240 and the minimum thickness of the light-transmitting functional layer 250 may be the same or different.
  • the display substrate further includes a first insulating layer 400 between the light conversion layer 240 and the second electrode 220 , and a portion of the first insulating layer 400 located within the opening 310 is away from the substrate.
  • the surface of the substrate 100 is closer to the base substrate 100 than at least part of the surface of the defining portion 320 that is remote from the base substrate 100 .
  • the first insulating layer 400 may be an encapsulation layer to encapsulate the light-emitting functional layer and the second electrode of the light-emitting element.
  • the distance d1 between the surface of the encapsulation layer on the side away from the base substrate 100 and the base substrate 100 is different from the distance d2 between at least part of the surface of the defining portion 320 on the side far away from the base substrate 100 and the base substrate 100 .
  • the difference between the above distance d1 and the distance d2 may be 5.5 microns.
  • the difference between the above distance d1 and the distance d2 may be 6 microns.
  • the difference between the above distance d1 and the distance d2 may be 6.5 microns.
  • the difference between the above distance d1 and the distance d2 may be 7 microns.
  • the difference between the above distance d1 and the distance d2 may be 7.5 microns.
  • the difference between the above distance d1 and the distance d2 may be 8 microns.
  • the difference between the above distance d1 and the distance d2 may be 8.5 microns.
  • the difference between the above distance d1 and the distance d2 may be 9 microns.
  • the difference between the above distance d1 and the distance d2 may be 9.5 microns.
  • the difference between the above distance d1 and the distance d2 may be 10 microns.
  • the first insulating layer 400 covers the defining portion 320 and the opening 310 , and the light conversion layer 240 is located on the first insulating layer 400 in the opening 310 .
  • the surface of the portion of the first insulating layer 400 located in the opening 310 away from the base substrate 100 is a flat surface.
  • the second electrode 220 and the first insulating layer 400 are disposed between the light conversion layer 240 and the light-emitting functional layer 230 , thereby greatly reducing the friction between the light conversion layer and the light-emitting functional layer. distance.
  • the distance between the light conversion layer 240 and the light-emitting functional layer 230 is less than 5 microns.
  • the distance between the light conversion layer 240 and the light-emitting functional layer 230 is less than 4.8 microns.
  • the distance between the light conversion layer 240 and the light-emitting functional layer 230 is less than 4.5 microns.
  • the distance between the light conversion layer 240 and the light-emitting functional layer 230 is less than 4.2 microns.
  • the distance between the light conversion layer 240 and the light-emitting functional layer 230 is less than 4 microns.
  • the distance between the light conversion layer 240 and the light-emitting functional layer 230 is less than 3.7 microns.
  • the distance between the light conversion layer 240 and the light-emitting functional layer 230 is less than 3.5 microns.
  • the distance between the light conversion layer 240 and the light-emitting functional layer 230 is less than 3.3 microns.
  • the distance between the light conversion layer 240 and the light-emitting functional layer 230 is less than 3 microns.
  • the thickness of first insulating layer 400 is less than the thickness of at least a portion of defining portion 320 .
  • the difference between the thickness of the first insulating layer 400 and the thickness of the defining portion 320 is at least 1 micron.
  • the difference between the thickness of the first insulating layer 400 and the thickness of the defining portion 320 is at least 1.5 microns.
  • the difference between the thickness of the first insulating layer 400 and the thickness of the defining portion 320 is at least 2 microns.
  • the difference between the thickness of the first insulating layer 400 and the thickness of the defining portion 320 is at least 2.5 microns.
  • the difference between the thickness of the first insulating layer 400 and the thickness of the defining portion 320 is at least 3 microns.
  • the difference between the thickness of the first insulating layer 400 and the thickness of the defining portion 320 is at least 4 microns.
  • the difference between the thickness of the first insulating layer 400 and the thickness of the defining portion 320 is at least 5 microns.
  • the total thickness of the light-emitting functional layer 230 , the second electrode 220 and the first insulating layer 400 is smaller than the thickness of the defining portion 320 , so that the light conversion layer 240 can be formed within the opening 310 defined by the defining portion 320 .
  • the first insulating layer 400 includes at least two film layers, such as film layer 410 and film layer 420 , and the thickness difference of different film layers is less than 1 micron.
  • the thickness difference between different film layers is less than 0.9 microns.
  • the thickness difference between different film layers is less than 0.8 microns.
  • the thickness difference between different film layers is less than 0.7 microns.
  • the thickness difference between different film layers is less than 0.6 microns.
  • the thickness difference between different film layers is less than 0.5 microns.
  • the thickness difference between different film layers is less than 0.4 microns.
  • the first insulation layer 400 may include at least two inorganic insulation layers.
  • each film layer included in the first insulating layer 400 may be an inorganic layer.
  • each film layer included in the first insulating layer 400 may contain silicon (Si).
  • the first insulating layer serves as the encapsulation layer, by only providing an inorganic insulating layer with a thinner thickness, the depth of the opening can be retained as much as possible to form, such as printing a light conversion layer, in the opening.
  • the embodiments of the present disclosure are not limited thereto, and the first insulating layer may also include an organic insulating layer.
  • the cross section of the defining portion 320 taken by a plane perpendicular to the base substrate 100 can be a trapezoid, and the angle between the trapezoidal hypotenuse and the bottom is small, such as not greater than 45 degrees. It is beneficial to increase the ratio of the maximum opening defining the light-emitting functional layer to the maximum opening defining the light conversion layer.
  • FIG. 3 is a schematic partial cross-sectional structural diagram taken along line BB’ shown in FIG. 1A according to an example of an embodiment of the present disclosure
  • FIG. 4A is a partial cross-sectional structural schematic diagram taken along CC’ shown in FIG. 1A.
  • the plurality of light-emitting elements 200 includes light-emitting elements 200 of at least two colors, such as a first light-emitting element 201 , a second light-emitting element 202 and a third light-emitting element 203 .
  • the defining portion 320 between the corresponding openings 310 of adjacent light-emitting elements 200 of different colors includes a first sub-limiting portion 321
  • the defining portion 320 between the corresponding openings 310 of adjacent and same-colored light-emitting elements 200 includes a second sub-limiting portion. 322
  • the maximum thickness of the first sub-defining portion 321 is greater than the maximum thickness of the second sub-defining portion 322
  • the portion of the second electrode 220 covering the second sub-defining portion 322 is continuously provided.
  • the continuous arrangement of the portion of the second electrode 220 covering the second sub-defining portion 322 means that the second electrode 220 covers the surface of the second sub-defining portion 322 away from the base substrate 100 and covers the surface of the second sub-defining portion 322 .
  • Continuous structure For example, the portion of the second electrode 220 covering at least two light-emitting elements is a continuous structure.
  • the difference between the maximum thickness of the first sub-defining portion 321 and the maximum thickness of the second sub-defining portion 322 is at least 1 micron.
  • the difference between the maximum thickness of the first sub-defining portion 321 and the maximum thickness of the second sub-defining portion 322 is 2 microns.
  • the difference between the maximum thickness of the first sub-defining portion 321 and the maximum thickness of the second sub-defining portion 322 is at least 3 microns.
  • the difference between the maximum thickness of the first sub-defining portion 321 and the maximum thickness of the second sub-defining portion 322 is at least 4 microns.
  • the difference between the maximum thickness of the first sub-defining portion 321 and the maximum thickness of the second sub-defining portion 322 is at least 5 microns.
  • the difference between the maximum thickness of the first sub-defining portion 321 and the maximum thickness of the second sub-defining portion 322 is at least 6 microns.
  • the difference between the maximum thickness of the first sub-defining portion 321 and the maximum thickness of the second sub-defining portion 322 is at least 7 microns.
  • the limiting portion 320 includes an annular defining portion 323 surrounding the plurality of light-emitting elements 200 , and the maximum thickness of the annular defining portion 323 is greater than the maximum thickness of the second sub-limiting portion 322 .
  • the light conversion layer 240 is limited within the opening 310 of the pixel defining pattern 300 to prevent the light conversion layer 240 from overflowing the defining portion 320 .
  • the maximum thickness of the annular defining part 323 is the same as the maximum thickness of the first sub-limiting part 321, but is not limited thereto.
  • the maximum thickness of the annular defining part may be greater than the maximum thickness of the first sub-limiting part, or may be less than the maximum thickness of the first sub-limiting part.
  • the maximum thickness of the sublimiter is the maximum thickness of the annular defining part 323 surrounding the plurality of light-emitting elements 200 , and the maximum thickness of the annular defining portion 323 is greater than the maximum thickness of the second sub-limiting portion 322 .
  • the surface of the first sub-defining portion 321 on the side away from the base substrate 100 includes a slope with a slope angle that is different from the surface of the second sub-defining portion 322 on the side far away from the base substrate 100 . Included slopes have equal slope angles.
  • the embodiments of the present disclosure are not limited thereto, and the slope angle of the slope included on the side of the first sub-defining portion away from the base substrate may be greater than the slope angle of the slope included on the side of the second sub-defining portion away from the base substrate. The slope angle is to improve the continuity of the second electrode at the position covering the second sub-definition.
  • the light conversion layer 240 covers the surface of the second sub-defining portion 322 away from the base substrate 100 .
  • the light conversion layer 240 is a continuous structure at the second sub-defining portion 322 .
  • the light conversion layer 240 includes a portion located between openings defined by adjacent second sub-defining portions 322 and a portion covering the second sub-defining portion 322 .
  • the surface of the light conversion layer 240 on the side away from the base substrate 100 is further away from the base substrate 100 than the surface of the second sub-defining portion 322 on the side away from the base substrate 100 .
  • the surface of the part of the light conversion layer 240 located on the second sub-defining portion 322 that is far away from the base substrate 100 is closer to the base substrate 100 than the side surface of the first sub-defining portion 321 that is far from the base substrate 100 .
  • the openings formed between adjacent first sub-defining portions 321 are used to define the light conversion layer 240 position to prevent the light conversion layer 240 from overflowing the limiting portion 320 .
  • the light conversion layer 240 may cover the second sub-defining portion 322 .
  • the light conversion layers 240 of adjacent light-emitting elements 200 with the same color can be in a continuous structure, and a first sub-defining portion 321 is provided between the light conversion layers 240 of adjacent light-emitting elements 200 with different colors to achieve separation between them. set up.
  • FIG. 2 schematically shows that the second electrode 220 covering the plurality of first sub-defining parts 321 is a continuously arranged film layer.
  • the thickness of the first sub-defining parts 321 is set larger to form a light conversion layer.
  • the second electrode 220 is easily disconnected at the edge of the first sub-defining portion 321, causing the second electrode 220 covering the defining portion 320 between adjacent and different-color light-emitting elements 200 to be a discontinuous film layer. affect the display effect.
  • the defining portion as a sub-defining portion with at least two different thicknesses, the continuity of the second electrode is ensured at a position with a smaller thickness, so as to improve the display of the display substrate. Effect.
  • FIG. 1B is a partial planar structural diagram of a display substrate according to an example of an embodiment of the present disclosure.
  • FIG. 4B is a partial cross-sectional structural diagram taken along C1C1' shown in FIG. 1B.
  • the display substrate shown in FIG. 1B is different from the display substrate shown in FIG. 1A in that the shape of the opening of the pixel defining pattern is different and the width of the second sub-defining portion is different.
  • the first sub-limiting part 321 and the second sub-defining part 322 may be integrally formed structures, or may be separately formed structures.
  • the second sub-defining portion 322 only includes a portion with a smaller thickness
  • the first sub-defining portion 321 includes a portion with the same thickness as the second sub-defining portion 322 (such as a portion below the dotted line) and a portion beyond the second sub-defining portion 322 part (such as the part above the dotted line).
  • the position where the first sub-defining part 321 and the second sub-defining part 322 are connected may be an arc surface, so that the recessed part formed by the first sub-defining part 321 and the second sub-defining part 322 is a cross-section taken by the XZ plane Can be U-shaped or V-shaped.
  • FIG. 5 is a partial cross-sectional structural diagram taken along line DD’ shown in FIG. 1A according to another example of an embodiment of the present disclosure.
  • the difference between the display substrate shown in FIG. 5 and the display substrate shown in FIG. 3 is that the side surface of the first sub-defining portion 321 away from the base substrate 100 includes a first slope 3210 , and the second sub-defining portion 322 is away from the base substrate 100 .
  • One side surface of 100 includes a second slope 3220, and the slope angle ⁇ 1 of the first slope 3210 is greater than the slope angle ⁇ 1 of the second slope 3220.
  • the structures of the base substrate, first insulating layer, light-emitting functional layer, and first electrode in the display substrate shown in FIG. 5 can be the same as those of the base substrate, first insulating layer, light-emitting functional layer, and third electrode in the display substrate shown in FIG. 3 .
  • the structures such as an electrode have the same characteristics and will not be described again here.
  • the slope angle of the first slope formed on the side surface of the first sub-defining portion away from the base substrate is the angle between the partial surface of the first sub-defining portion close to the base substrate and a plane parallel to the base substrate
  • the slope angle of the second slope formed by the side surface of the two sub-defining parts away from the base substrate is the angle between the partial surface of the second sub-defining part close to the base substrate and a plane parallel to the base substrate.
  • the slope angle of the above-mentioned first sub-limiting part may refer to the shape of the first slope intercepted by the XZ plane as a straight line or a curve, the angle between the straight line and the contact position of the first electrode, or the intersection point of the curve with the first electrode and X The angle between the directions.
  • the slope angle of the second sub-defining part may refer to the shape of the second slope intercepted by the YZ plane as a straight line or a curve, the angle between the straight line and the first electrode contact position, or the angle between the curve and the first electrode contact position.
  • the angle between the intersection point of an electrode and the Y direction but is not limited to this.
  • the above slope angle can refer to the tangent line at the midpoint of the curve intercepted by the XZ plane (or YZ plane) and the X direction (or Y direction). ).
  • the maximum thickness of the second sub-defining portion 322 is larger to achieve spaced arrangement of the light conversion layers 240 of adjacent and same-color light-emitting elements 200 .
  • the surface of the second sub-defining portion 322 on the side away from the base substrate 100 is further away from the base substrate 100 than the surface of the light conversion layer 240 on the side closer to the base substrate 100 .
  • the surface of the second sub-defining portion 322 on the side away from the base substrate 100 may be farther away from the base substrate 100 than the surface of the light conversion layer 240 on the side far away from the base substrate 100 , or may be further away from the base substrate than the light conversion layer 240 .
  • the surface on the side of the light conversion layer 240 is flush with the base substrate 100 , or closer to the base substrate 100 than the surface of the light conversion layer 240 on the side far away from the base substrate 100 .
  • the embodiment of the present disclosure does not limit this, and can be set according to the continuity of the second electrode.
  • At least two adjacent light-emitting elements 200 arranged along the first direction emit light of the same color
  • the at least two adjacent light-emitting elements 200 arranged along the second direction emit light of the same color.
  • the colors are different and the first direction intersects with the second direction.
  • 1A to 5 schematically show that the first direction is the Y direction and the second direction is the X direction. But it is not limited to this, the first direction and the second direction can be interchanged.
  • the first direction is perpendicular to the second direction, but is not limited thereto.
  • the angle between the first direction and the second direction may be 70 to 110 degrees, or 80 to 100 degrees, or 85 to 95 degrees.
  • one of the first direction and the second direction is the row direction, and the other is the column direction.
  • the limiting part 320 includes a plurality of first sub-defining parts 321 and a plurality of second sub-defining parts 322, and at least one first sub-defining part 321 extends along the first direction, And a second sub-limiting portion 322 extending along the second direction is provided between two adjacent first sub-limiting portions 321.
  • the second sub-limiting portions 322 provided between two adjacent first sub-limiting portions 321 are arranged parallel to each other.
  • FIG. 1A schematically shows that the shape of the opening 310 defined by the limiting part 320 can be rectangular, but it is not limited thereto.
  • the shape of the opening 310 can also be a strip shape as shown in FIG. 1B , or other shapes, such as an oval, Circle, trapezoid, etc.
  • first sub-defining part 321 and the second sub-defining part 322 may be an integrated structure formed in the same process, or may be a structure formed in separate steps.
  • the annular defining part 323 may be an integral structure formed in the same process as the first sub-defining part 321 and the second sub-defining part 322, or may be a structure formed in separate steps.
  • the display substrate further includes a signal transmission line 500 located on a side of the first electrode 210 facing the base substrate 100 .
  • the display substrate includes a display area 101 and a peripheral area 102 surrounding the display area 101.
  • the signal transmission line 500 is located in the peripheral area 102.
  • the signal transmission line 500 may be a circle of wiring surrounding the display area 101 .
  • the display substrate further includes a transmission portion 510 located on a side of the first electrode 210 facing the substrate substrate 100 and electrically connected to the signal transmission line 500 .
  • the transmission portion 510 is located at the defining portion.
  • the edgemost part of 320 is close to one side of the display area 101 , and the second electrode 220 is electrically connected to the transmission part 510 .
  • the edgemost portion of the defining portion 320 may be an annular defining portion 323 .
  • the signal transmission line 500 is configured to transmit a VSS signal, such as a negative voltage signal, to the second electrode 220 .
  • the boundary of the second electrode 220 exceeds the boundary of the light-emitting functional layer 230 , and the portion of the second electrode 220 that exceeds the boundary of the light-emitting functional layer 230 is electrically connected to the transmission part 510 .
  • an opening 3100 is provided between the annular defining portion 323 and the nearest and spaced-apart second sub-limiting portion 322 , and no light-emitting element is provided in the opening 3100 .
  • the second electrode 220 located in the opening 3100 is electrically connected to the transmission part 510 .
  • the transmission part 510 is disposed directly opposite the opening 3100 .
  • part of the light-emitting functional layer 230 may be provided in the opening 3100 , or no light-emitting functional layer 230 may be provided.
  • at least part of the second electrode 220 does not overlap with the light-emitting functional layer 230.
  • the portion of the second electrode 220 in the opening 3100 that does not overlap with the light-emitting functional layer 230 is electrically connected to the transmission part 510 .
  • the opening 3100 may be provided with an electrode connection part 501 arranged in the same layer as the first electrode 210 , and the second electrode 220 may be electrically connected to the transmission part 510 through the electrode connection part 501 .
  • the embodiments of the present disclosure are not limited thereto.
  • the electrode connecting portion disposed in the same layer as the first electrode 210 may not be provided in the opening, and the second electrode is electrically connected to the transmission portion 510 through a via hole in the insulating layer.
  • Embodiments of the present disclosure set the thickness of the partial defining portion located in the center area of the pixel defining pattern to be smaller than the thickness of the defining portion at the edge of the pixel defining pattern, and set the transmission portion of the signal transmission line electrically connected to the second electrode to be located at the edge. At least part of the defining part is located close to the side of the defining part with a smaller thickness. While realizing the continuous arrangement of the second electrodes arranged in at least part of the display area, the continuously arranged second electrodes in this part are electrically connected to the above-mentioned transmission part. Connect to achieve good electrical connection with the second electrode.
  • the display substrate further includes a pixel circuit electrically connected to the light-emitting element to drive the light-emitting element to emit light.
  • the display substrate also includes a data line electrically connected to the pixel circuit. The data line is located between the first electrode of the light-emitting element and the base substrate.
  • the signal Transmission lines can be set up on the same layer as data lines.
  • the transmission part 510 may be provided on the same layer as the signal transmission line 500 , for example, the transmission part 510 may be a part of the signal transmission line 500 .
  • the transmission part 510 may be located between the film layer where the signal transmission line 500 is located and the film layer where the first electrode 210 of the light-emitting element 200 is located.
  • the transmission part 510 may be disposed in the same layer as at least part of the first electrode 210 .
  • the transmission part 510 may be located between the film layer where the second electrode 220 of the light-emitting element 200 is located and the film layer where the first electrode 210 is located.
  • Figures 2, 4A and 5 do not show the film layer between the first electrode 210 and the base substrate 100.
  • Figure 3 only shows the transmission part 510 and the insulating layer between the transmission part 510 and the first electrode 210.
  • Other film layers between the first electrode 210 and the base substrate 100 are not shown.
  • FIG. 6 is a partial planar structural schematic diagram of a display substrate according to another example of an embodiment of the present disclosure
  • FIG. 7 is a partial cross-sectional structural schematic diagram taken along line EE' shown in FIG. 6
  • the display substrate in the example shown in FIG. 6 is different from the display substrate shown in FIG. 1A in that the structural features of the defining portion 320 are different.
  • the display substrate in the example shown in FIG. 6 includes a base substrate 100, a light emitting element 200 and a third An insulating layer 400 may have the same characteristics as the base substrate 100, the light-emitting element 200 and the first insulating layer 400 included in the display substrate in the example shown in FIG. 1A, which will not be described again here.
  • the display substrate further includes an electrode overlap portion 520 .
  • the electrode overlap portion 520 is located on a side of the defining portion 320 facing the substrate substrate 100 and along a direction perpendicular to the substrate substrate 100 . direction, the limiting portion 320 overlaps the electrode overlap portion 520 .
  • the defining portion 320 includes an opening or slot 324 that exposes the electrode overlap portion 520 , and the second electrode 220 is electrically connected to the electrode overlap portion 520 through the opening or slot 324 .
  • the slots 324 or the openings may include carbon elements, and the slots 324 or the openings may also include oxygen elements.
  • the actual contact area between the second electrode 220 and the electrode overlap portion 520 is smaller than the width of the slot 324 or smaller than the maximum size of the opening.
  • the electrode overlapping portion 520 in the example shown in FIG. 6 can have the same function as the transmission portion 510 in the example shown in FIG. 1A , such as electrically connecting the second electrode 220 to the signal transmission line 500 .
  • the part 520 and the transmission part 510 may have the same structural features, or may have different structural features, which are not limited in the embodiment of the present disclosure.
  • the electrode overlap may also be called an auxiliary cathode.
  • At least part of the electrode overlap 520 extends in the same direction as at least part of the defining part 320 . For example, if the electrode overlapping portion 520 overlaps the limiting portion 320 extending along the first direction, then the electrode overlapping portion 520 extends along the first direction. For example, if the electrode overlapping portion 520 overlaps the limiting portion 320 extending along the second direction, then the electrode overlapping portion 520 extends along the second direction.
  • the electrode overlap portion 520 overlaps at least a portion of the defining portion 320 .
  • the defining portion 320 covers the edge of the electrode overlap portion 520 .
  • the orthographic projection of the electrode overlap portion 520 surrounding at least one side of an opening on the base substrate 100 is located within the orthographic projection of the limiting portion 320 on the base substrate 100 , which can alleviate inconsistencies caused by voltage drops at various locations on the display substrate. Evenly.
  • the extending direction of the slot 324 in the limiting portion 320 is the same as the extending direction of the limiting portion 320
  • the extending direction of the slot 324 is the same as the extending direction of the electrode overlap portion 520 exposed by it. same.
  • the limiting portion 320 includes a plurality of first sub-defining portions 321 extending along the first direction and arranged along the second direction, and a plurality of first sub-defining portions 321 located between adjacent first sub-defining portions 321 extending along the second direction.
  • the plurality of second sub-limiting portions 322 are arranged between adjacent first sub-limiting portions 321 and are arranged along the first direction.
  • the second sub-limiting portions 322 arranged along the second direction are located on a straight line.
  • the slot 324 provided in a first sub-limiting part 321 may penetrate the first sub-limiting part 321 in the first direction, or may be located only in part of the first sub-limiting part 321 without penetrating the first sub-limiting part 321 .
  • a first sub-defining portion 321 may be provided with one slot 324 extending along the first direction, or may be provided with multiple slots 324.
  • the multiple slots 324 may extend along the first direction and along the Arranged in the second direction, they may also extend along the first direction and be arranged at intervals along the first direction.
  • the slot 324 provided in a second sub-limiting portion 322 may penetrate the second sub-limiting portion 322 in the second direction, or may be located only in part of the second sub-limiting portion 322 without penetrating the second sub-limiting portion 322 .
  • a second sub-defining portion 322 may be provided with one slot 324 extending along the second direction, or may be provided with multiple slots 324.
  • the multiple slots 324 may extend along the second direction and along the They may be arranged in the first direction, or they may extend along the second direction and be arranged at intervals along the second direction.
  • a first sub-limiting portion 321 is provided between two adjacent second sub-limiting portions 322 arranged along the second direction, and the slot 324 provided in the second sub-limiting portion 322 can penetrate the first sub-limiting portion 321 , may also be located only in the second sub-limiting part 322, if it does not penetrate the second sub-limiting part 322, or if there is a gap between it and the first sub-limiting part 321.
  • FIG. 6 schematically shows that each first sub-defining portion 321 and each second sub-defining portion 322 are provided with a slot 324, and each sub-defining portion is provided with two slots 324.
  • the annular defining portion No slots are provided in 323, but the embodiment of the present disclosure is not limited thereto.
  • only the first sub-defining portion is provided with slots, and the second sub-defining portion and the annular defining portion are not provided with slots.
  • the number of slots provided in different first sub-defining parts may be the same or different.
  • the number of slots provided in different second sub-defining parts may be the same or different.
  • the number of slots provided in a first sub-defining part and the number of slots provided in a second sub-defining part may be the same or different.
  • the patterned defining portion 230 is provided with a groove 324.
  • the groove 324 is filled with the light-emitting functional layer; before forming the second electrode 220, a laser is used to remove at least one of the grooves 324.
  • a portion of the light-emitting functional layer 230 is formed such that the slot 324 exposes the electrode overlap portion 520 , and a portion of the second electrode 220 is formed in the slot 324 to connect with the electrode overlap portion 520 .
  • the display substrate further includes a signal transmission line 500 located on a side of the first electrode 210 facing the base substrate 100 .
  • the display substrate includes a display area and a peripheral area surrounding the display area (refer to the display area 101 and the peripheral area 102 shown in FIG. 1A ).
  • the signal transmission line 500 is located in the peripheral area.
  • the second electrode 220 is electrically connected to the signal transmission line 500 through the electrode overlap portion 520 . connect.
  • the electrode overlapping portion 520 extends to the peripheral area to be electrically connected to the signal transmission line 500 .
  • the electrode overlap 520 may be formed in a mesh shape.
  • each first sub-defining portion 321 is provided with two slots 324 , and the two slots 324 connect each first sub-defining portion. 321 is divided into three parts.
  • the maximum thickness of the part located in the middle is greater than the maximum thickness of the two parts located on both sides.
  • the surface of the middle part located on the side away from the base substrate 100 is further away from the base substrate 100 than the surface of the light conversion layer 240 on the side far away from the base substrate 100 , and the two surfaces located on both sides are further away from the base substrate 100 .
  • the surface of at least a part of the portions on the side away from the base substrate 100 is closer to the base substrate 100 than the surface of the light conversion layer 240 on the side away from the base substrate 100 .
  • the light conversion layer 240 covers at least a part of the two parts located on both sides of the first sub-defining part 321 .
  • the maximum thickness of the two parts located on both sides of the first sub-limiting part 321 may be the same or different.
  • the second sub-defining part 322 may be provided with three parts having the same characteristics as the first sub-defining part 321.
  • the embodiment of the present disclosure is not limited to the three parts shown in Figure 7 being provided in each sub-defining part.
  • each sub-defining part may include two parts, and the maximum thickness of the two parts may be the same, or the maximum thickness of the two parts may be the same.
  • each sub-limiting part can include two parts, and at least one of the two parts can be set as a step structure, and the maximum thickness of the middle part of the step structure is larger; when the number of slots is When there are three, each sub-defining part may include four parts, wherein the maximum thickness of at least one part located in the middle is greater than the maximum thickness of at least one part located at the edge.
  • a slot is provided in the defining portion of the pixel defining pattern so that the second electrode of the light-emitting element is electrically connected to the electrode overlap portion through the slot, which is beneficial to improving the efficiency of the second electrode and the electrode overlap.
  • the electrical connection effect of the connector is beneficial to realizing that the opening defined by the defining part is filled with the light conversion layer at the same time,
  • the second electrode has good continuity.
  • the electrode overlap portion 520 includes at least one film layer disposed on the same layer as the first electrode 210 .
  • the first electrode 210 may include multiple film layers, the electrode overlap portion 520 may be one film layer, and the electrode overlap portion 520 may be formed in the same patterning process as a film layer in the first electrode 210 .
  • the electrode overlapping portion 520 is spaced apart and insulated from the first electrode 210 .
  • Fig. 8A is a partial cross-sectional structural schematic diagram taken along the FF' line shown in Fig. 6, and Fig. 8B is a partial enlarged view along the F1 region shown in Fig. 8A.
  • the ratio of the maximum thickness of the defining portion 320 between the light-emitting elements 200 with different emitting colors to the maximum thickness of the defining portion 320 between the light-emitting elements 200 with the same emitting color is: 0.8 ⁇ 1.
  • the ratio of the maximum thickness of the limiting portion 320 between light-emitting elements 200 with different emitting colors to the maximum thickness of the limiting portion 320 between light-emitting elements 200 with the same emitting color is 0.85 to 0.88.
  • the ratio of the maximum thickness of the limiting portion 320 between light-emitting elements 200 with different emitting colors to the maximum thickness of the limiting portion 320 between light-emitting elements 200 with the same emitting color is 0.9 to 0.95.
  • the ratio of the maximum thickness of the limiting portion 320 between light-emitting elements 200 with different emitting colors to the maximum thickness of the limiting portion 320 between light-emitting elements 200 with the same emitting color is 0.92 to 0.97.
  • the maximum thickness of the defining portion 320 between the light-emitting elements 200 with different emitting colors is the same as the maximum thickness of the defining portion 320 between the light-emitting elements 200 with the same emitting color.
  • the limiting portion 320 between the light-emitting elements 200 with different emitting colors is the first sub-limiting portion 321
  • the limiting portion 320 between the light-emitting elements 200 with the same emitting color is the second sub-limiting portion. portion 322
  • the ratio of the maximum thickness of the first sub-limiting portion 321 to the maximum thickness of the second sub-limiting portion 322 is 0.8 to 1.
  • the ratio of the maximum thickness of the first sub-limiting portion 321 to the maximum thickness of the second sub-limiting portion 322 is 0.9 ⁇ 0.95.
  • the ratio of the maximum thickness of the first sub-limiting portion 321 to the maximum thickness of the second sub-limiting portion 322 is 0.92 ⁇ 0.97.
  • the maximum thickness of the first sub-defining portion 321 is the same as the maximum thickness of the second sub-defining portion 322 .
  • the maximum thickness of the limiting portion extending in the first direction and the limiting portion extending in the second direction are substantially the same, by providing a groove in the limiting portion to expose the electrode overlap portion, The second electrode is electrically connected to the electrode overlap portion through the slot, so as to achieve a good electrical connection effect between the second electrode and the signal transmission line.
  • the second electrode 220 located on the middle limiting portion 031 and the second electrode 220 located on the two side limiting portions 032 have a disconnected structure.
  • a slot 324 is provided between them, and the light-emitting functional layer 230 in the slot 324 is removed before forming the second electrode 220 , so that the second electrode 220 can be formed in the slot 324 to be electrically connected to the electrode overlap 520 .
  • the second electrode 220 located on the middle defining part is disconnected from the second electrodes 220 located on both sides of the defining parts. structure, by providing a slot 324 between the middle defining portion and the defining portions on both sides, and removing the light-emitting functional layer 230 in the slot 324 before forming the second electrode 220, the second electrode 220 can be formed in the slot. 324 to be electrically connected to the electrode overlap portion 520 .
  • Figure 9 is a partial cross-sectional structural diagram taken along line EE' shown in Figure 6 according to another example of an embodiment of the present disclosure.
  • the display substrate in the example shown in FIG. 9 is different from the display substrate in the example shown in FIG. 7 in that the structure of the electrode overlap portion 520 is different.
  • the base substrate, light-emitting elements, pixel defining patterns, first insulating layer and other structures in the display substrate in the example shown in FIG. 9 can be the same as the base substrate, light-emitting elements, pixel defining patterns and other structures in the display substrate in the example shown in FIG. 7
  • the structures such as the pattern and the first insulating layer have the same characteristics and will not be described again here.
  • the electrode overlap 520 includes multiple film layers, and the distance between the surface of the electrode overlap 520 away from the base substrate 100 and the base substrate 100 is greater than the first electrode.
  • 210 is the distance between the surface on the side away from the base substrate 100 and the base substrate 100 .
  • the thickness of the electrode overlap 520 is greater than the thickness of the first electrode 210 .
  • the thickness of the electrode overlap portion is set to be greater than the thickness of the first electrode, it is convenient for the second electrode to be electrically connected to the electrode overlap portion through the slot, which is beneficial to reducing the resistance of the second electrode.
  • the electrode overlap 520 includes a film layer located on a side of the first electrode 210 away from the base substrate 100 .
  • the electrode overlap portion 520 includes a film layer on the same layer as the first electrode 210 and a film layer located on a side of the first electrode 210 away from the base substrate 100 .
  • the film layer disposed on the same layer as the first electrode 210 in the electrode overlap portion 520 can be formed in the same patterning process as the first electrode 210 .
  • FIG. 10 is a schematic partial cross-sectional structural diagram taken along line EE’ shown in FIG. 6 according to another example of an embodiment of the present disclosure.
  • the display substrate in the example shown in FIG. 10 is different from the display substrate in the example shown in FIG. 7 in that the positions of the electrode overlap portions 520 are different.
  • the structures such as the base substrate, light-emitting elements, and pixel defining patterns in the display substrate in the example shown in FIG. 10 have the same characteristics as those of the base substrate, light-emitting elements, and pixel defining patterns shown in FIG. 7 , and will not be described again here. .
  • the electrode overlap portion 520 is located between the first electrode 210 and the base substrate 100 .
  • the display substrate further includes a pixel circuit electrically connected to the first electrode 210 of the light-emitting element 200, including a light-emitting control transistor.
  • the light-emitting control transistor includes an active layer 261, a gate electrode 264, a source electrode 262 and a
  • the drain electrode 263 is electrically connected to the first electrode 210 of the light-emitting element 200 .
  • the electrode overlapping portion 520 and the source electrode 262 are arranged in the same layer.
  • the display substrate further includes a first gate insulating layer 103 , a second gate insulating layer 104 , an interlayer insulating layer 105 , a passivation layer 106 and a planarization layer 600 .
  • planarization layer 600 is provided with vias or slots 601 corresponding to slots 324.
  • the flat layer 600 is located between the first electrode 210 of the light emitting element 200 and the base substrate 100 .
  • the electrode overlap portion 520 may include a multi-layer film layer
  • the multi-layer film layer may include a film layer disposed on the same layer as the first electrode 210 and a film layer disposed on the same layer as the source electrode of the light emission control transistor.
  • Figure 11 is a partial cross-sectional structural schematic diagram taken along line EE' shown in Figure 6 according to another example of an embodiment of the present disclosure.
  • the display substrate in the example shown in FIG. 11 is different from the display substrate in the example shown in FIG. 10 in that the position of the electrode overlap 520 is different and the structure of the flat layer 600 is different.
  • the structures such as the base substrate, light-emitting elements, and pixel defining patterns in the display substrate in the example shown in FIG. 11 have the same characteristics as those of the base substrate, light-emitting elements, and pixel defining patterns shown in FIG. 10 , and will not be described again here. .
  • the flat layer 600 includes a flat layer protrusion 610
  • the orthographic projection of the flat layer protrusion 610 on the base substrate 100 is consistent with the projection of the electrode overlap 520 on the base substrate 100 .
  • the orthographic projection overlaps such that the distance between the surface of the electrode overlap portion 520 away from the base substrate 100 and the base substrate 100 is greater than the distance between the surface of the first electrode 210 away from the base substrate 100 and the base substrate 100 distance.
  • the flat layer protrusion 610 does not overlap with the light-emitting area of the light-emitting element 200 .
  • Figure 12 is a partial cross-sectional structural diagram taken along line EE' shown in Figure 6 according to another example of an embodiment of the present disclosure.
  • the display substrate in the example shown in FIG. 12 is different from the display substrate in the example shown in FIG. 11 in that the structure of the flat layer 600 is different.
  • the position of the electrode overlapping portion in the display substrate shown in FIG. 12 can be the same as the position of the electrode overlapping portion in the display substrate shown in FIG.
  • the position of the connecting part is the same, and this example does not limit this.
  • the structures such as the base substrate, light-emitting elements, and pixel defining patterns in the display substrate in the example shown in FIG. 12 have the same characteristics as those of the base substrate, light-emitting elements, and pixel defining patterns shown in FIG. 10 , and will not be described again here. .
  • the flat layer 600 includes a groove 620 , and the defining portion 320 does not overlap with the groove 620 in a direction perpendicular to the base substrate 100 . At least part of the first electrode 210 and the light-emitting functional layer 230 of the light-emitting element 200 are located in the groove 620 , and the surface of the light-emitting functional layer 230 closer to the base substrate 100 is farther from the surface of the base substrate 100 than the electrode overlap portion 520 . closer to the base substrate 100 .
  • the ratio of the thickness of the flat layer at locations with grooves and at locations without grooves can be 0.1 to 0.9.
  • the ratio of the thickness of the flat layer at locations with grooves and at locations without grooves can be 0.15 to 0.7.
  • the ratio of the thickness of the flat layer at locations with grooves and at locations without grooves can be 0.2 to 0.85.
  • the ratio of the thickness of the flat layer at locations with grooves and at locations without grooves can be 0.25 to 0.75.
  • the ratio of the thickness of the flat layer at locations with grooves and at locations without grooves can be 0.3 to 0.85.
  • the ratio of the thickness of the flat layer at locations with grooves and at locations without grooves can be 0.4 to 0.5.
  • the ratio of the thickness of the flat layer at locations with grooves and at locations without grooves can be 0.35 to 0.65.
  • the ratio of the thickness of the flat layer at locations with grooves and at locations without grooves can be 0.55 to 0.6.
  • grooves are provided in the flat layer and the electrode overlap portion is provided at the intervals between adjacent grooves, which is equivalent to setting the position of the electrode overlap portion higher. It is beneficial to overlap the second electrode of the light-emitting element and the electrode overlap portion.
  • the surface of the light-emitting functional layer 230 away from the base substrate 100 may be farther away from the base substrate 100 than the surface of the electrode overlap 520 away from the base substrate 100 .
  • Figure 13 is a partial cross-sectional structural diagram taken along line EE' shown in Figure 6 according to another example of an embodiment of the present disclosure.
  • the display substrate in the example shown in FIG. 13 is different from the display substrate in the example shown in FIG. 12 in that the depth of the groove 620 in the flat layer 600 is different.
  • Figure 13 does not illustrate the film layer between the flat layer 600 and the base substrate 100.
  • the film layer provided between the flat layer 600 and the base substrate 100 in Figure 13 can refer to the flat layer 600 and the base substrate 100 shown in Figure 12 film layers between them.
  • At least a portion of the side surface of the light-emitting functional layer 230 away from the base substrate 100 may be closer to the base substrate 100 than the side surface of the electrode overlap 520 away from the base substrate 100 .
  • at least some of the plurality of film layers included in the light-emitting functional film layer 230 are closer to the base substrate 100 than the electrode overlap portion 520 .
  • at least a portion of the second electrode 220 located in the groove 620 is closer to the base substrate 100 than the electrode overlap 520 .
  • the openings 310 of the pixel defining pattern overlap the grooves 620 .
  • at least part of the orthographic projection of light conversion layer 240 on planar layer 600 is located within groove 620 .
  • the orthographic projection of the light conversion layer 240 onto the planar layer 600 lies entirely within the groove 620 .
  • the maximum thickness of the defining portion 320 in the display substrate provided by the example shown in FIG. 13 may be smaller than the maximum thickness of the defining portion 320 in the display substrate provided by the examples shown in FIGS. 7 to 12 .
  • a groove is provided in the flat layer, and at least part of the film layer of the light-emitting functional layer is disposed farther away from the surface on the side farther from the base substrate than the electrode overlap portion is farther away from the side surface of the base substrate. Close to the base substrate, the height of the defining portion can be reduced as much as possible while the light conversion layer is completely located within the opening defined by the defining portion, so as to improve the continuity of the second electrode.
  • FIG. 14 and 15 are partial cross-sectional structural schematic diagrams taken along line EE' shown in FIG. 6 according to different examples of embodiments of the present disclosure.
  • the difference between the display substrate in the examples shown in FIG. 14 and FIG. 15 and the display substrate in the example shown in FIG. 13 is that a transparent compensation structure 630 is provided in the groove 620 in the flat layer 600 .
  • the difference between the display substrates in the examples shown in FIG. 14 and FIG. 15 lies in the position of the transparent compensation structure 630 .
  • the base substrate, first insulating layer, light-emitting functional layer, pixel defining pattern, first electrode and other structures in the display substrate shown in Figures 14 and 15 can be combined with the base substrate, first insulating layer in the display substrate shown in Figure 13
  • the layers, light-emitting functional layers, pixel defining patterns, first electrodes and other structures have the same characteristics and will not be described again here.
  • the display substrate further includes a transparent compensation structure 630 located between the light conversion layer 240 and the bottom of the groove 620 .
  • the light conversion layer can be formed on a relatively flat surface as much as possible to improve the performance of the light conversion layer formed in the groove. Flatness, improve display effect.
  • the transparent compensation structure 630 may be located between the first electrode 210 and the planar layer 600 .
  • the transparent compensation structure 630 may be located between the light conversion layer 240 and the second electrode 210 .
  • the transparent compensation structure 630 can be a part of the film layer in the first insulating layer 400 .
  • the first insulating layer 400 can be an encapsulation layer.
  • the thickness of the portion of the encapsulation layer located at the groove 620 is greater than that located at the groove 620 . Thickness at locations outside groove 620.
  • the encapsulation layer located within groove 620 may include an organic encapsulation layer.
  • the transparent compensation structure 630 may also be a lens.
  • embodiments of the present disclosure are not limited to filling the grooves with transparent compensation structures to improve the flatness of the middle portion of the light conversion layer.
  • the light conversion layer can also be formed by layering to improve the flatness of the middle portion of the light conversion layer.
  • the sidewalls 621 of the groove 620 are inclined, and the portion of the sidewall 621 away from the base substrate 100 is further away from the groove 620 than the portion close to the base substrate 100 .
  • the sidewalls of groove 620 may be inclined outward.
  • the above-mentioned outer side means that the center of the light-emitting element surrounded by the groove points to the edge side.
  • the pattern in which the side wall 621 of the groove 620 is cut by a plane perpendicular to the base substrate 100 may be a straight line or a curve.
  • FIGS. 16 to 17B are partial planar structural diagrams of a display substrate provided according to different examples of embodiments of the present disclosure.
  • the display substrate in the example shown in FIGS. 16 to 17B is different from the display substrate in the example shown in FIG. 6 in that the defining portion 320 in the display substrate shown in FIGS. 16 to 17B includes an opening 325 .
  • the second electrode of the light-emitting element may be electrically connected to the electrode overlapping portion 520 through the plurality of openings 325 .
  • the display substrate in the example shown in FIGS. 16 to 17B is different in that the shape of the light-emitting area of the light-emitting element is different.
  • the electrode overlapping portion 520 may be provided only at the position corresponding to the opening 325 , or the electrode overlapping portion 520 may be provided in the same extending direction as the extending direction of the limiting portion 320 .
  • the electrical connection effect between the second electrode and the electrode overlapping portion can be improved while minimizing the overlapping between the second electrode and the electrode.
  • the problem of short circuit or leakage with the first electrode at the external connection position occurs.
  • the center of the portion of the second electrode 220 and the electrode overlap portion 520 does not coincide with the center of the opening 325 .
  • the area of the portion between the second electrode 220 and the electrode overlap 520 is smaller than the area of the orthographic projection of the opening 325 on the electrode overlap 520 .
  • the openings 325 arranged along the row direction can be arranged at equal intervals, and the openings 325 arranged along the row direction are located on the same straight line; the openings 325 arranged along the column direction can also be arranged at equal intervals, along the columns.
  • the directional openings 325 may be located on the same straight line.
  • the spacing between the openings 325 arranged along the row direction and the spacing between the openings 325 arranged along the column direction may be the same.
  • some of the openings 325 may be blind holes, that is, the light-emitting functional layer in the openings 325 is not removed, and the second electrode does not overlap the electrode overlap portion at the blind hole position. Setting blind holes helps improve process efficiency.
  • the largest interval among the intervals between the light-emitting areas of adjacent light-emitting elements 200 of different colors and the intervals between adjacent light-emitting elements 200 of the same color intersects with the opening 325 .
  • FIGS. 16 to 17A there is a gap 204 with the largest size between the light-emitting areas between the row of the first light-emitting element 201 and the column of the third light-emitting element 203 that are adjacent to each other, and an opening is provided at the gap 204 325, which is helpful to avoid the occurrence of short circuit or leakage problem with the first electrode at the connection position between the second electrode and the electrode overlap portion.
  • the above-mentioned “column” refers to a plurality of first light-emitting elements arranged in a Y direction, a plurality of second light-emitting elements arranged in a Y direction, and a plurality of third light-emitting elements arranged in a Y direction.
  • openings 325 may also be provided at the largest distance 205 between the column of the third light-emitting element 203 and the column of the second light-emitting element 202 .
  • the maximum size of gap 205 is smaller than the maximum size of gap 204.
  • openings 325 can be provided between adjacent light-emitting elements of different colors.
  • openings 325 may also be provided between adjacent light-emitting elements of the same color.
  • the opening 325 may be provided at the position with the largest distance between the light-emitting areas of adjacent light-emitting elements of the same color.
  • openings 325 may be provided at positions with minimum spacing between the light-emitting areas of adjacent light-emitting elements of different colors.
  • the first light-emitting element 201 can be a red light-emitting element
  • the second light-emitting element 202 can be a green light-emitting element
  • the third light-emitting element 203 can be a blue light-emitting element.
  • the shape of the light-emitting area of the green light-emitting element 202 may be a hexagon or an octagon.
  • the shape of the light-emitting area of the green light-emitting element 202 may be an axially symmetrical figure, for example, the symmetry axis extends along the Y direction.
  • the shape of the light-emitting area of at least one of the blue light-emitting element 203 and the red light-emitting element 201 may be an octagon.
  • the shape of the light-emitting area of at least one of the blue light-emitting element 203 and the red light-emitting element 201 may be non-shaped in the Y direction. Symmetrical graphics.
  • the plurality of light-emitting elements 200 can be arranged into two sub-rows of light-emitting elements, one sub-row of light-emitting elements includes red light-emitting elements 201 and blue light-emitting elements 203 alternately arranged along the row direction (such as the X direction), and the other sub-row of light-emitting elements It includes green light-emitting elements 202 arranged along the row direction. In the row direction, the distance between the light-emitting areas of two adjacent green light-emitting elements 202 is greater than the distance between the light-emitting areas of the adjacent blue light-emitting elements 203 and the red light-emitting element 201.
  • the opening 325 is provided between the light-emitting areas of two adjacent green light-emitting elements 202 in the row direction.
  • the distance between the light-emitting areas of adjacent red light-emitting elements 201 arranged in the column direction (such as the Y direction) and the distance between the light-emitting areas of adjacent blue light-emitting elements 203 arranged in the column direction is greater than
  • the opening 325 may be disposed between the light-emitting areas of adjacent red light-emitting elements 201 arranged in the column direction.
  • Figure 18 is a schematic partial cross-sectional structural diagram taken along line AA' shown in Figure 1A in another example according to an embodiment of the present disclosure.
  • the difference between the display substrate in the example shown in FIG. 18 and the display substrate in the example shown in FIG. 2 is that the display substrate further includes a spacer (PS) 340 located at least partially in the defining portion 320 away from the base substrate 100 s surface.
  • PS spacer
  • the spacer 340 is located between the defining portion 320 and the second electrode 220 .
  • the spacer 340 is configured to support an evaporation mask for forming the light-emitting functional layer.
  • the orthographic projection of the spacer 340 on the base substrate 100 is completely located within the orthographic projection of the limiting portion 320 on the base substrate 100 .
  • the side surface of the light conversion layer 240 away from the base substrate 100 is further away from the base substrate 100 than the side surface of the defining portion 320 away from the base substrate 100 .
  • the surface of the light conversion layer 240 on the side away from the base substrate 100 is closer to the base substrate 100 than the surface of the spacer 340 on the side far away from the base substrate 100 .
  • the opening formed by the spacer can be used to define the light conversion layer, and the maximum thickness of the defining portion of the pixel defining pattern is set smaller than the thickness of the light conversion layer, which is beneficial Improve the continuity of the second electrode.
  • the maximum thickness of the first sub-defining portion and the maximum thickness of the second sub-defining portion in the pixel defining pattern are substantially the same.
  • the first sub-limiting portion 321 and the annular defining portion 323 are provided with spacers 340 on the side surface away from the base substrate 100
  • the second sub-defining portion 322 is not provided with spacers 340 on the side surface away from the base substrate 100 . .
  • the slots in the example shown in FIG. 6 can be provided in the position of the defining portion 320 where the spacer 340 is not provided.
  • the position of the first sub-defining portion 321 where the spacer 340 is not provided can be provided with a groove to allow the second electrode to 220 is electrically connected to the electrode overlap portion.
  • the size of the spacer 340 in a direction parallel to the base substrate 100 is smaller than the size of the defining portion 320 in this direction, which is beneficial to improving the continuity of the second electrode formed on the defining portion and the spacer.
  • FIG. 19 is a schematic partial cross-sectional structural diagram taken along line AA' shown in FIG. 1A in another example according to an embodiment of the present disclosure.
  • the limiting part 320 includes a first limiting part 3201 and a second limiting part 3202 arranged in a stack.
  • the first limiting part 3201 is located on the second limiting part.
  • the defining portion 3202 is close to the side of the base substrate 100 , and the surface of the light conversion layer 240 close to the base substrate 100 is closer to the base substrate 100 than at least part of the surface of the second defining portion 3202 that is far away from the base substrate 100 .
  • the structures of the light-emitting elements, the base substrate, the first insulating layer, etc. in the display substrate provided in this example can be the same as the light-emitting elements, the base substrate, the first insulating layer, etc. in the display substrate in any of the examples shown in FIG. 2 to FIG. 17A
  • the structures have the same characteristics and will not be repeated here.
  • the surface of the first limiting portion 3201 away from the base substrate 100 is closer to the base substrate 100 than the surface of the light conversion layer 240 away from the base substrate 100 , and the second limiting portion 3202 is far away from the base substrate 100 .
  • the side surface of 100 is farther away from the base substrate 100 than the side surface of the light conversion layer 240 is farther away from the base substrate 100 .
  • the opening 311 defined by the first defining portion 3201 can be used to define the light-emitting functional layer 230
  • the opening defined by the second defining portion 3202 312 may be used to define light conversion layer 240.
  • the defining portion in the display substrate provided in this example, by configuring the defining portion as a stacked first defining portion and a second defining portion, it is beneficial to increase the overall thickness of the defining portion to form an opening area for defining the light conversion layer, which is beneficial to the light conversion layer Flexible setting of thickness.
  • the maximum size of the orthographic projection of the opening 311 defined by the first defining portion 3201 on the substrate 100 may be smaller than the maximum size of the orthographic projection of the opening 312 defined by the second defining portion 3202 on the substrate 100 .
  • the embodiments of the present disclosure are not limited thereto.
  • the maximum size of the orthographic projection of the opening 311 on the base substrate 100 may also be greater than or equal to the maximum size of the orthographic projection of the opening 312 on the base substrate 100 .
  • the maximum size of the first limiting portion 3201 may be larger than the maximum size of the second limiting portion 3202 .
  • the first insulating layer 400 is disposed between the first defining portion 3201 and the second defining portion 3202 .
  • the second electrode 220 is further disposed between the first limiting part 3201 and the second limiting part 3202.
  • a light-emitting functional layer 230 is further provided between the first limiting part 3201 and the second limiting part 3202.
  • the limiting part by arranging the limiting part as a stacked first limiting part and a second limiting part, and a first insulating layer, such as an encapsulation layer, is provided between the first limiting part and the second limiting part, the overall thickness of the limiting part can be While being larger to form the opening defining the light conversion layer, the thickness of the first defining portion is set smaller to improve the continuity of the second electrode formed on the first defining portion.
  • FIG. 19 schematically shows that the thickness of the first limiting part 3201 is greater than the thickness of the second limiting part 3202, but it is not limited thereto.
  • the thickness of the first limiting part may be smaller than the thickness of the second limiting part to further improve the thickness of the first limiting part 3201. Continuity of the second electrode on a defined portion.
  • the defining part shown in FIG. 19 may include a first sub-defining part and a second sub-defining part having different thicknesses in the example shown in FIGS. 2 to 3 , or may include a first sub-defining part and a second sub-defining part in the example shown in FIG. 5
  • the second sub-defining part either includes the slot shown in Figure 6 and the electrode overlap portion arranged opposite to the slot, or includes the opening shown in Figure 16 and the electrode overlap portion arranged opposite the opening, or includes Figure 18
  • the spacers shown are not limited in this example.
  • the surface of the flat layer in the display substrate shown in FIG. 19 away from the base substrate may be a flat surface, or include grooves in the flat layer as shown in any one of FIGS. 12 to 15 , or include the grooves in the flat layer as shown in FIG. 11 Flat layer bulge.
  • FIG. 20 is a schematic partial cross-sectional structural diagram taken along line AA' shown in FIG. 1A in another example according to an embodiment of the present disclosure.
  • the difference between the display substrate in the example shown in FIG. 20 and the display substrate in the example shown in FIG. 19 is that the first limiting part 3201 and the second limiting part 3202 are in direct contact.
  • the structures of the light-emitting elements, the base substrate, the first insulating layer, etc. in the display substrate provided in this example can be the same as the light-emitting elements, the base substrate, the first insulating layer, etc. in the display substrate in any of the examples shown in FIG. 2 to FIG. 17A The structures have the same characteristics and will not be repeated here.
  • the defining portion 320 includes at least two layers arranged in a stack.
  • FIG. 20 schematically shows that the limiting part 320 includes a two-layer structure, but is not limited thereto.
  • the limiting part may also include a structure in which three or more layers are stacked. For example, any two adjacent layers in the multi-layer structure included in the limiting portion are in direct contact, or the layer of the multi-layer structure included in the limiting portion that is farthest from the base substrate is located on the side of the first insulating layer away from the base substrate, Or at least two layers of the multi-layer structure included in the defining part are located on a side of the first insulating layer away from the base substrate.
  • the first insulating layer 400 is located on the side of the second limiting portion 3202 away from the first limiting portion 3201 .
  • the second electrode 220 is located on a side of the second limiting portion 3202 away from the first limiting portion 3201 .
  • the maximum size of the first limiting portion 3201 may be larger than the maximum size of the second limiting portion 3202 , but is not limited thereto.
  • the size of the first limiting part may also be less than or equal to the maximum size of the second limiting part.
  • the slope angle of the slope formed by the side surface of the second limiting portion 3202 away from the base substrate 100 may be smaller than the slope angle of the slope formed by the side surface of the first limiting portion 3201 away from the base substrate 100 . , to improve the continuity of the second electrode formed on the second defining portion.
  • the stacked first limiting part shown in Figure 20 may include the slot shown in Figure 11, and the second limiting part may not overlap with the slot, just as the same first limiting part may include two slots to form three
  • the first limiting part located in the middle part is provided with a second limiting part, and the first limiting part located on both sides has no second limiting part so that the second limiting part can expose the groove.
  • the first limiting portion 3201 and the second limiting portion 3202 are perpendicular to the plane of the substrate 100 , and the cross-sectional shapes taken by the XZ plane can be the same, such as trapezoids, and the trapezoids are far away from the substrate.
  • the bottom on one side of the substrate 100 is the upper bottom, and the bottom of the trapezoid close to the side of the substrate 100 is the lower bottom.
  • the length of the lower bottom is greater than the length of the upper bottom.
  • the embodiments of the present disclosure are not limited thereto.
  • the shapes of the cross-sections of the first limiting part and the second limiting part taken by a plane perpendicular to the base substrate may be different, such as the cross-sectional shape of one of the first limiting part and the second limiting part. is a trapezoid, and the cross-sectional shape of the other is a rectangle; for example, the shape of the first limiting part is a stepped shape, and the shape of the second limiting part is a trapezoid, a rectangle, a triangle, an arc, etc., the embodiment of the present disclosure has a The cross-sectional shape of the second limiting portion is not limited.
  • the cross section of the second limiting portion 3202 taken by a plane perpendicular to the base substrate 100 can be a trapezoid, and the angle between the hypotenuse of the trapezoid and the bottom is small, such as not greater than 45 degrees, which is beneficial to increasing the limited light emitting function.
  • the materials of the first limiting part 3201 and the second limiting part 3202 may be the same or different.
  • the maximum dimension of the surface of the first limiting part 3201 in a direction parallel to the base substrate 100 may be smaller than the surface of the second limiting part 3202
  • the largest dimension along the direction parallel to the base substrate 100 is to form an undercut structure.
  • FIG. 21 is a schematic partial cross-sectional structural diagram taken along line AA' shown in FIG. 1A in another example according to an embodiment of the present disclosure.
  • the display substrate further includes an isolation structure 350 located between the second electrode 220 and the defining portion 320 .
  • the structures such as the light-emitting element, the base substrate, and the first insulating layer in the display substrate provided in this example may have the same structure as the light-emitting element, the base substrate, the first insulating layer, and other structures in any of the examples shown in FIG. 2 to FIG. 17A Characteristics will not be described in detail here.
  • the isolation structure 350 overlaps the defining portion 320 , and the materials of the isolation structure 350 and the defining portion 320 are different, along the arrangement of adjacent light-emitting elements. direction, the edge of the isolation structure 350 in the isolation structure 350 located between the adjacent light-emitting elements protrudes relative to the edge of the defining portion 320 to form a protrusion.
  • the material of isolation structure 350 includes inorganic non-metallic materials.
  • the material of the isolation structure 350 includes any one or more of silicon nitride, silicon oxide, or silicon oxynitride.
  • the shape of the isolation structure 350 can be configured so that the light-emitting functional layer 230 is disconnected at the protruding portion, and the second electrode 220 is continuously provided at the protruding portion.
  • the ratio between the thickness of the isolation structure 350 and the defining portion 320 and the thickness of the light-emitting functional layer 230 is 0.7 ⁇ 1.5.
  • at least part of the side surface of the isolation structure 350 has a slope angle greater than 60 degrees with a plane parallel to the base substrate 100 .
  • the size of the protrusion in a direction parallel to the base substrate 100 is not less than 0.01 micron.
  • the surface of the isolation structure 350 away from the base substrate 100 is a curved surface that curves toward the base substrate 100 side.
  • the side surface of the light conversion layer 240 away from the base substrate 100 is further away from the base substrate 100 than the side surface of the defining portion 320 away from the base substrate 100 .
  • the surface of the light conversion layer 240 on the side away from the base substrate 100 is closer to the base substrate 100 than the surface of the isolation structure 350 on the side far away from the base substrate 100 .
  • the light conversion layer can be defined in the opening area formed by the isolation structure, and the maximum thickness of the defining part of the pixel defining pattern is set smaller than the thickness of the light conversion layer, which is beneficial to improving the third Continuity of two electrodes.
  • the maximum thickness of the first sub-defining portion and the maximum thickness of the second sub-defining portion in the pixel defining pattern are substantially the same.
  • only the first sub-defining portion 321 and the annular defining portion 323 are provided with the isolation structure 350 on the side surface away from the base substrate 100
  • the second sub-defining portion 322 is not provided with the isolation structure 350 on the side surface away from the base substrate 100 .
  • the slots 324 shown in FIG. 6 may be provided in the limiting part 320 and the isolation structure 350 to electrically connect the second electrode 220 to the electrode overlap part.
  • the size of the isolation structure 350 in a direction parallel to the base substrate 100 is smaller than the size of the defining portion 320 in this direction, which is beneficial to improving the continuity of the second electrode formed on the defining portion and the spacer.
  • the defining portion 320 may be a one-layer structure.
  • the embodiments of the present disclosure are not limited to this, and the limiting part may also include a multi-layer stacked structure forming any shape from FIG. 22 to FIG. 26 .
  • the cross section of the limiting portion 320 taken by a plane connecting the centers of the light-emitting areas of two adjacent light-emitting elements 200 on both sides thereof is the limiting portion cross-section 3200 .
  • the shape of the cross section 3200 includes a trapezoid or a step shape, and the plane is perpendicular to the base substrate 100 .
  • the plane may be the XZ plane.
  • the shape of the defining portion cross section 3200 may be a trapezoid, with the upper bottom of the trapezoid closer to the base substrate 100 than the lower bottom, such as an inverted trapezoid.
  • the size of the surface of the limiting portion 320 on the side away from the base substrate 100 in the X direction is larger than the size of the surface of the limiting portion 320 on the side close to the base substrate 100 in the X direction.
  • the size of the maximum opening defining the light-emitting functional layer can be larger than the size of the maximum opening defining the light conversion layer, thereby avoiding cross-coloring of light of different colors.
  • a reflective layer or reflective particles can also be provided on the side surface or inside of the limiting portion.
  • the shape of the defining portion cross section 3200 may be stepped.
  • the size of the largest opening defining the light-emitting functional layer can be smaller than the size of the largest opening defining the light-converting layer, allowing the maximum range of light emitted by the light-emitting element to be incident on the light-converting layer.
  • the shape of the defining portion cross section 3200 may be a trapezoid, with the upper bottom of the trapezoid further away from the base substrate 100 than the lower bottom.
  • the size of the surface of the limiting portion 320 on the side away from the base substrate 100 in the X direction is smaller than the size of the surface of the limiting portion 320 on the side close to the base substrate 100 in the X direction.
  • the defining portion cross-sections 3200 of the defining portions 320 defining the light-emitting areas of different light-emitting elements 200 have different shapes, such as defining the limiting portion cross-section 3200 of the third light-emitting element 203 toward the light-emitting area of the third light-emitting element 203 .
  • the angle between the hypotenuse and the plane parallel to the base substrate 100 is smaller than the angle between the hypotenuse of the defining portion section 3200 away from the light-emitting area of the third light-emitting element 203 and the plane, which is conducive to adjusting the light emission of different colors. Component light emission angle and light emission efficiency.
  • the third light-emitting element 203 may be a blue light-emitting element, a red light-emitting element, or a green light-emitting element.
  • the cross section of the limiting portion 320 taken by the plane connecting the centers of the light-emitting areas of two adjacent light-emitting elements 200 on both sides thereof is the limiting portion cross-section 3200 .
  • the size of the middle part of the cross section 3200 in the direction parallel to the base substrate 100 is larger or smaller than the size of the two side parts in the direction parallel to the base substrate 100 , and the plane is perpendicular to the base substrate 100 .
  • the plane may be the XZ plane.
  • the defining portion cross section 3200 of the defining portion 320 may have a concave structure in the middle.
  • the limiting portion cross section 3200 of the limiting portion 320 may have a convex middle structure.
  • the defining portion of any shape shown in FIGS. 22 to 26 may include a first sub-defining portion and a second sub-defining portion with different thicknesses in the examples shown in FIGS. 2 to 3 , or include the example shown in FIG. 5
  • the first sub-defining portion and the second sub-defining portion either include a slot as shown in Figure 6 and an electrode overlap portion arranged opposite to the slot, or include an opening as shown in Figure 16 and an electrode arranged opposite to the opening.
  • the overlapping portion may include spacers as shown in Figure 18, which is not limited in this example.
  • the surface of the flat layer in the display substrate away from the substrate may be a flat surface, or include grooves in the flat layer as shown in any one of FIGS. 12 to 15 , or include The flat layer protrusions shown in Figure 11.
  • FIG. 27 is a partial cross-sectional structural schematic diagram taken along line AA' shown in FIG. 1A in another example according to an embodiment of the present disclosure.
  • the difference between the display substrate in the example shown in FIG. 27 and the display substrate in the example shown in FIG. 2 is that the display substrate further includes a second insulating layer 710 located on the side of the light conversion layer 240 away from the base substrate 100 .
  • the second insulation layer 710 may be an encapsulation layer that encapsulates the light conversion layer 240 .
  • the second insulating layer 710 includes refractive particles 711 .
  • the material of the refractive particles 711 may include zirconium oxide.
  • the second insulating layer with refractive particles By arranging the second insulating layer with refractive particles on the light extraction side of the light conversion layer, it is beneficial to improve the light extraction efficiency.
  • the pixel defining pattern, light emitting element, base substrate, first insulating layer and other structures in the display substrate shown in Figure 27 can be the same as the pixel defining pattern, light emitting element, base substrate, first insulating layer and other structures in any of the examples from Figure 2 to Figure 26
  • the insulation layer and other structures have the same characteristics and will not be described again here.
  • FIG. 28 is a partial cross-sectional structural diagram taken along line AA' shown in FIG. 1A in another example according to an embodiment of the present disclosure.
  • the difference between the display substrate in the example shown in FIG. 28 and the display substrate in the example shown in FIG. 27 is that the display substrate further includes a color filter layer 720 located on the side of the second insulating layer 710 away from the light conversion layer 240 .
  • the color filter layer 720 includes a portion located in a light-emitting area and a portion located in an adjacent light-emitting area.
  • the first light-emitting element 201 can be a red light-emitting element
  • the color film corresponding to the first light-emitting element 201 in the color film layer 720 can be a red color film
  • the second light-emitting element 202 can be a green light-emitting element
  • the color film in the color film layer 720 can be a red light-emitting element.
  • the color film corresponding to the second light-emitting element 202 can be a green color film; the third light-emitting element 203 can be a blue light-emitting element, and the material in the color film layer 720 corresponding to the third light-emitting element 203 can be a blue color film.
  • the color filter layers 720 provided on the defining portion 320 between the light-emitting areas of adjacent light-emitting elements can be stacked to play a light filtering role.
  • a stack of red color film and green color film is provided on the defining portion 320 between the light-emitting area of the first light-emitting element 201 and the light-emitting area of the second light-emitting element 202, and the light-emitting area of the second light-emitting element 202 and the third light-emitting element 202 are
  • a stack of a green color film and a blue color film is provided on the defining portion 320 between the light-emitting areas of the light-emitting element 203 .
  • the color filter layer shown in Figure 28 can use COE (Color On Encapsulation) technology to form a color filter on the encapsulation layer to improve the contrast of the display device.
  • COE Color On Encapsulation
  • a groove is formed at a position corresponding to the light conversion layer 240.
  • the groove is directly opposite the opening of the pixel defining pattern, and the color filter layer 720 includes portions formed within the grooves.
  • the surface of the color filter layer 720 close to the base substrate 100 may be a flat surface, and at least part of the surface of the color filter layer 720 away from the base substrate may be a concave surface toward the base substrate 100 side.
  • a cover plate can be provided on the display side of the display substrate, and the above-mentioned color filter layer can also be provided on the side of the cover plate facing the display substrate.
  • Figure 29 is a display substrate provided according to another embodiment of the present disclosure.
  • the display substrate includes a base substrate 100 and a plurality of light emitting elements 200 and a pixel defining pattern 300 located on the base substrate 100 .
  • the light-emitting element 200 includes a light-emitting functional layer 230 and a first electrode 210 and a second electrode 220 located on both sides of the light-emitting functional layer 230 in a direction perpendicular to the base substrate 100.
  • the first electrode 210 is located between the light-emitting functional layer 230 and the base substrate 100.
  • the pixel defining pattern 300 is located on the side of the first electrode 210 away from the base substrate 100 .
  • the pixel defining pattern 300 includes a plurality of openings 310 and a defining portion 320 surrounding the plurality of openings 310 .
  • the light emitting element 200 is at least partially located in the openings 310 .
  • At least one light-emitting element 200 further includes a light conversion layer 240.
  • the light conversion layer 240 is configured such that light of one color is incident on the light conversion layer and light of another color is emitted.
  • the light conversion layer 240 is located away from the first electrode 210 and the second electrode. 220 on one side.
  • the light conversion layer is arranged on the side of the first electrode away from the second electrode, which can minimize the distance between the light conversion layer and the light-emitting functional layer, thereby improving the light conversion layer's response to incident light. Light conversion efficiency.
  • the light-emitting functional layer 230 in the display substrate shown in FIG. 29 may have the same characteristics as the light-emitting functional layer 230 in the display substrate shown in FIG. 1A, which will not be described again.
  • the first electrode 210 of the light-emitting element 200 is a light-transmitting electrode
  • the second electrode 220 is a reflective electrode.
  • the light emitted by the light-emitting functional layer 230 is reflected by the second electrode 220 toward the side of the first electrode 210 away from the second electrode 220 to pass through the light conversion layer 240 and then be emitted.
  • the maximum size, such as thickness, of the defining portion in the display substrate shown in FIG. 29 in the direction perpendicular to the base substrate 100 can be set smaller to define the area where the light-emitting functional layer of the light-emitting element is formed.
  • the display In the substrate by setting the thickness of the defining portion smaller, it is beneficial to improve the continuity of the second electrode.
  • the light conversion layer 240 is located on a side of the base substrate 100 away from the first electrode 210 .
  • the light conversion layer 240 and the light-transmitting functional layer 250 in the display substrate shown in FIG. 29 may have the same characteristics as the light conversion layer 230 and the light-transmitting functional layer 250 in the display substrate shown in FIGS. 1A to 2 , where No longer.
  • a separation structure 800 is provided on the side of the base substrate 100 away from the first electrode 210 for defining the positions of the light conversion layer 230 and the light-transmitting functional layer 250 .
  • the orthographic projection of the separation structure 800 on the base substrate 100 overlaps with the orthographic projection of the defining portion 320 on the base substrate 100 .
  • the opening area formed by the separation structure 800 is used to form the light conversion layer 240 and the light-transmitting functional layer 250 .
  • the limiting part 320 in the display substrate shown in FIG. 29 may be provided with a defining part including a first sub-defining part and a second sub-defining part with different thicknesses as shown in the examples shown in FIGS. 2 to 3 , or may be provided as shown in FIG. 5
  • the first sub-defining part and the second sub-defining part in the example are either provided with slots as shown in Figure 6 and electrode overlapping parts arranged opposite to the slots, or are provided with openings and openings as shown in Figure 16 Oppositely arranged electrode overlap portions.
  • the display substrate shown in FIG. 29 may include a flat layer as shown in FIGS. 10 to 15 .
  • the light conversion layer 240 is provided with a substrate 810 on a side away from the base substrate 100 .
  • the surface of the light conversion layer 240 away from the base substrate 100 may be a flat surface, and the surface of the light conversion layer 240 close to the base substrate 100 may be a concave surface toward the side away from the base substrate 100 .
  • a color filter layer may be disposed between the light conversion layer 240 and the substrate 810.
  • the display substrate further includes a first insulating layer 400 located on the side of the second electrode 220 away from the base substrate 100 .
  • the first insulating layer 400 may be an encapsulation layer, and the encapsulation layer may include a stacked organic layer. Encapsulation layer and inorganic encapsulation layer.
  • FIG. 30 is a schematic partial cross-sectional structural diagram of a display device according to another embodiment of the present disclosure.
  • the display device includes the display substrate 10 shown in any of the above examples.
  • FIG. 30 schematically shows that the display device includes the display substrate shown in FIG. 2 , but is not limited thereto and may also include the display substrate 10 shown in FIG. 4A to Any display substrate shown in Figure 29.
  • the display device further includes a counter substrate 20 disposed opposite to the display substrate 10 , and the counter substrate 20 is located on the display side of the display substrate 10 .
  • the light emitted by the light-emitting element is emitted from the side of the second electrode 220 away from the base substrate 100 , and the counter substrate 20 is located on the side of the second electrode 220 away from the base substrate 100 .
  • the counter substrate is located on the side of the base substrate away from the second electrode.
  • the material layer 21 disposed at a position directly facing the light conversion layer 240 on the side of the opposite substrate 20 facing the display substrate 10 includes the same material as the material in the light conversion layer 240 .
  • the opposite substrate 20 may include a cover plate 23 and a separation structure 22 located on the side of the cover plate 21 facing the display substrate 10 .
  • the material layer 21 is defined by an opening formed by the separation structure 22 .
  • the display device further includes a color filter layer (not shown in the figure), and the color filter layer may be disposed on a side of the material layer away from the display substrate.
  • the display device provided by the embodiment of the present disclosure may be an organic light-emitting diode display device.
  • the display device can be any product or component with a display function such as a mobile phone with an under-screen camera, a tablet computer, a notebook computer, a navigator, etc. This embodiment is not limited thereto.

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Abstract

一种显示基板以及显示装置。该显示装置包括衬底基板以及位于衬底基板上的多个发光元件和像素限定图案。发光元件包括发光功能层、第一电极和第二电极；像素限定图案包括多个开口以及围绕多个开口的限定部，发光元件至少部分位于开口中。发光元件还包括光转换层，光转换层被配置为使得一种颜色光入射到光转换层后出射另一种颜色光，光转换层位于第二电极远离衬底基板的一侧，且光转换层的至少部分位于开口内，光转换层位于开口内的部分靠近衬底基板的表面比限定部的至少部分远离衬底基板的表面更靠近衬底基板。本公开实施例提供的显示基板可以尽量减少光转换层与发光功能层之间的距离，以提高光转换层对入射的光的转换效率。

Description

显示基板以及显示装置 技术领域
本公开实施例涉及一种显示基板以及显示装置。
背景技术
有机发光二极管显示面板以其轻薄、可绕性、色彩绚丽、对比度高、响应速率快等优势，受到广泛的关注，逐渐替代液晶显示面板。有机发光二极管显示面板中可以设置量子点材料，如红色量子点材料和绿色量子点材料等。利用量子点材料，可以能够实现具有良好的颜色纯度的显示装置。
发明内容
本公开实施例提供一种显示基板以及显示装置。
本公开实施例提供一种显示基板包括衬底基板以及位于衬底基板上的多个发光元件以及像素限定图案。所述发光元件包括发光功能层以及沿垂直于所述衬底基板的方向位于所述发光功能层两侧的第一电极和第二电极，所述第一电极位于所述发光功能层与所述衬底基板之间；像素限定图案位于所述第一电极远离所述衬底基板一侧，所述像素限定图案包括多个开口以及围绕所述多个开口的限定部，所述发光元件至少部分位于所述开口中。至少一个发光元件还包括光转换层，所述光转换层被配置为使得一种颜色光入射到所述光转换层后出射另一种颜色光，所述光转换层位于所述第二电极远离所述衬底基板的一侧，且所述光转换层的至少部分位于所述开口内，所述光转换层中位于所述开口内的部分靠近所述衬底基板的表面比与所述限定部的至少部分远离所述衬底基板的表面更靠近所述衬底基板。
例如，根据本公开实施例，所述光转换层中位于所述开口内的部分远离所述衬底基板的表面比所述限定部的所述至少部分远离所述衬底基板的表面更靠近所述衬底基板。
例如，根据本公开实施例，所述光转换层中位于所述开口内的部分远离所述衬底基板的表面的中心部分比边缘部分更靠近所述衬底基板。
例如，根据本公开实施例，所述光转换层包括量子点。
例如，根据本公开实施例，显示基板还包括：第一绝缘层，位于所述光转换层与所述第二电极之间。所述第一绝缘层中位于所述开口内的部分的远离所述衬底基板的表面比所述限定部的所述至少部分远离所述衬底基板的表面更靠近所述衬底基板。
例如，根据本公开实施例，所述第一绝缘层的厚度小于所述限定部的所述至少部分的厚度。
例如，根据本公开实施例，所述第一绝缘层包括至少两层膜层，且不同膜层的厚度差小于1微米。
例如，根据本公开实施例，所述多个发光元件包括至少两种颜色的发光元件，位于相邻不同颜色的发光元件对应的开口之间的所述限定部包括第一子限定部，位于相邻且相同颜色的发光元件对应的开口之间的所述限定部包括第二子限定部，所述第一子限定部的最大厚度大于所述第二子限定部的最大厚度，和/或，所述第一子限定部远离所述衬底基板的一侧表面包括第一斜坡，所述第二子限定部远离所述衬底基板的一侧表面包括第二斜坡，所述第一斜坡的坡度角大于所述第二斜坡的坡度角；所述第二电极中覆盖所述第二子限定部的部分连续设置。
例如，根据本公开实施例，显示基板还包括：信号传输线，位于所述第一电极面向所述衬底基板的一侧；传输部，位于所述第一电极面向所述衬底基板的一侧，且与所述信号传输线电连接。所述显示基板包括显示区以及围绕所述显示区的周边区，所述信号传输线位于所述周边区，所述传输部位于所述限定部中最边缘的部分靠近所述显示区的一侧，且所述第二电极与所述传输部电连接。
例如，根据本公开实施例，沿第一方向排列的相邻的至少两个发光元件发光颜色相同，沿第二方向排列的相邻的至少两个发光元件的发光颜色不同，所述第一方向与所述第二方向相交；所述限定部包括多个第一子限定部和多个第二子限定部，至少一个第一子限定部沿所述第一方向延伸，且相邻两个第一子限定部之间设置有沿所述第二方向延伸的所述第二子限定部。
例如，根据本公开实施例，显示基板还包括：电极搭接部，位于所述限定部面向所述衬底基板的一侧，且沿垂直于所述衬底基板的方向，所述限定部与所述电极搭接部交叠。所述限定部包括暴露所述电极搭接部的开孔或开槽，所述第二电极通过所述开孔或所述开槽与所述电极搭接部电连接。
例如，根据本公开实施例，发光颜色不同的发光元件之间的所述限定部的最大厚度与发光颜色相同的发光元件之间的所述限定部的最大厚度的比值为0.8～1。
例如，根据本公开实施例，至少部分所述电极搭接部的延伸方向与至少部分所述限定部的延伸方向相同。
例如，根据本公开实施例，显示基板还包括：信号传输线，位于所述第一电极面向所述衬底基板的一侧。所述显示基板包括显示区以及围绕所述显示区的周边区，所述信号传输线位于所述周边区，所述第二电极通过所述电极搭接部与所述信号传输线电连接。
例如，根据本公开实施例，所述电极搭接部包括至少一层与所述第一电极同层设置的膜层。
例如，根据本公开实施例，所述电极搭接部包括多层膜层，且所述电极搭接部远离所述衬底基板一侧的表面与所述衬底基板之间的距离大于所述第一电极远离所述衬底基板一侧的表面与所述衬底基板之间的距离。
例如，根据本公开实施例，所述电极搭接部包括位于所述第一电极远离所述衬底基板的一侧的膜层。
例如，根据本公开实施例，显示基板还包括：平坦层，位于所述第一电极与所述衬底基板之间。所述平坦层包括平坦层凸出部，所述平坦层凸出部在所述衬底基板上的正投影与所述电极搭接部在所述衬底基板上的正投影交叠以使所述电极搭接部远离所述衬底基板一侧的表面与所述衬底基板之间的距离大于所述第一电极远离所述衬底基板一侧的表面与所述衬底基板之间的距离。
例如，根据本公开实施例，显示基板还包括：平坦层，位于所述第一电极与所述衬底基板之间。所述平坦层包括凹槽，沿垂直于所述衬底基板的方向，所述限定部与所述凹槽没有交叠；至少部分发光元件的所述第一电极和所述发光功能层位于所述凹槽内，且所述发光功能层远离所述衬底基板一侧的表面的至少部分比所述电极搭接部远离所述衬底基板一侧的表面更靠近所述衬底基板。
例如，根据本公开实施例，显示基板还包括：透明补偿结构，位于所述光转换层与所述凹槽底部之间。
例如，根据本公开实施例，所述凹槽的侧壁倾斜设置，且所述侧壁中远离所述衬底基板的部分比靠近所述衬底基板的部分更远离所述凹槽内设置的所 述发光元件的发光区的中心。
例如，根据本公开实施例，所述限定部包括所述开孔，所述多个发光元件包括至少两种不同颜色发光元件，相邻不同颜色发光元件的发光区之间的间隔和相邻相同颜色发光元件之间的间隔中至少尺寸最大的间隔处设置有所述开孔。
例如，根据本公开实施例，显示基板还包括：隔离结构，位于所述第二电极与所述限定部之间。沿垂直于所述衬底基板的方向，所述隔离结构与所述限定部交叠，且所述隔离结构与所述限定部的材料不同；沿相邻发光元件的排列方向，位于该相邻发光元件之间的所述隔离结构中所述隔离结构的边缘相对于所述限定部的边缘突出以形成突出部。
例如，根据本公开实施例，显示基板还包括：隔垫物，位于所述限定部中的至少部分远离所述衬底基板一侧的表面。
例如，根据本公开实施例，所述限定部包括层叠设置的第一限定部和第二限定部，所述第一限定部位于所述第二限定部靠近所述衬底基板的一侧，所述光转换层靠近所述衬底基板的表面比与所述第二限定部的至少部分远离所述衬底基板的表面更靠近所述衬底基板。
例如，根据本公开实施例，所述第一限定部与所述第二限定部直接接触；或者，所述显示基板还包括第一绝缘层，位于所述光转换层与所述第二电极之间，其中，所述第一限定部与所述第二限定部之间设置有所述第一绝缘层。
例如，根据本公开实施例，所述限定部被位于其两侧的相邻两个发光元件的发光区中心连线所在平面所截的截面为限定部截面，所述限定部截面的形状包括梯形或者阶梯状，所述平面垂直于所述衬底基板。
例如，根据本公开实施例，所述限定部被位于其两侧的相邻两个发光元件的发光区中心连线所在平面所截的截面为限定部截面，所述限定部截面的中间部分的平行于所述衬底基板的方向的尺寸大于或者小于两侧部分的平行于所述衬底基板方向的尺寸，所述平面垂直于所述衬底基板。
例如，根据本公开实施例，所述限定部包括层叠设置的至少两层结构。
例如，根据本公开实施例，所述发光功能层包括热活化延迟荧光材料。
例如，根据本公开实施例，所述多个发光元件包括至少两种颜色的发光元件，所述至少两种颜色的发光元件的所述发光功能层被配置为均发出第一颜色光，所述至少两种颜色的发光元件中的至少一种颜色发光元件包括所述光转换 层，且所述第一颜色光经过所述光转换层后转换为第二颜色光。
例如，根据本公开实施例，显示基板还包括：第二绝缘层，位于所述光转换层远离所述衬底基板的一侧；彩膜层，位于所述第二绝缘层远离所述光转换层的一侧。
例如，根据本公开实施例，所述第二绝缘层包括折射粒子。
本公开实施例提供的显示基板中，将光转换层靠近衬底基板的表面设置为比至少部分限定部远离衬底基板的表面更靠近衬底基板，可以尽量减少光转换层与发光功能层之间的距离，以提高光转换层对入射的光的转换效率。
本公开实施例提供一种显示基板，包括衬底基板以及位于衬底基板上的多个发光元件和像素限定图案。所述发光元件包括发光功能层以及沿垂直于所述衬底基板的方向位于所述发光功能层两侧的第一电极和第二电极，所述第一电极位于所述发光功能层与所述衬底基板之间；像素限定图案位于所述第一电极远离所述衬底基板一侧，所述像素限定图案包括多个开口以及围绕所述多个开口的限定部，所述发光元件至少部分位于所述开口中。至少一个发光元件还包括光转换层，所述光转换层被配置为使得一种颜色光入射到所述光转换层后出射另一种颜色光，所述光转换层位于所述第一电极远离所述第二电极的一侧。
本公开实施例提供的显示基板中，将光转换层设置在第一电极远离所述第二电极的一侧，可以尽量减少光转换层与发光功能层之间的距离，以提高光转换层对入射的光的转换效率。
本公开实施例提供一种显示装置，包括上述任一实施例所述的显示基板以及与所述显示基板相对设置的对置基板。所述对置基板位于所述显示基板的显示侧。
例如，根据本公开实施例，所述对置基板面向所述显示基板的一侧与所述光转换层正对的位置处设置的材料层包括与所述光转换层中的材料相同的材料。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对实施例的附图作简单地介绍，显而易见地，下面描述中的附图仅仅涉及本公开的一些实施例，而非对本公开的限制。
图1A为根据本公开实施例的一示例提供的显示基板的局部平面结构示意 图。
图1B为根据本公开实施例的一示例提供的显示基板的局部平面结构示意图。
图2为沿图1A所示的AA’所截的局部截面结构示意图。
图3为根据本公开实施例的一示例沿图1A所示BB’线所截的局部截面结构示意图。
图4A为沿图1A所示CC’所截的局部截面结构示意图。
图4B为沿图1B所示C1C1’所截的局部截面结构示意图。
图5为根据本公开实施例的另一示例沿图1A所示DD’线所截的局部截面结构示意图。
图6为根据本公开实施例的另一示例提供的显示基板的局部平面结构示意图。
图7为沿图6所示EE’线所截的局部截面结构示意图。
图8A为沿图6所示FF’线所截的局部截面结构示意图。
图8B为沿图8A所示F1区域局部放大意图。
图9为根据本公开实施例另一示例沿图6所示EE’线所截的局部截面结构示意图。
图10为根据本公开实施例另一示例沿图6所示EE’线所截的局部截面结构示意图。
图11为根据本公开实施例另一示例沿图6所示EE’线所截的局部截面结构示意图。
图12为根据本公开实施例另一示例沿图6所示EE’线所截的局部截面结构示意图。
图13为根据本公开实施例另一示例沿图6所示EE’线所截的局部截面结构示意图。
图14和图15为根据本公开实施例不同示例沿图6所示EE’线所截的局部截面结构示意图。
图16至图17B为根据本公开实施例的不同示例提供的显示基板的局部平面结构示意图。
图18为根据本公开实施例的另一示例中沿图1A所示AA’线所截的局部截面结构示意图。
图19为根据本公开实施例的另一示例中沿图1A所示AA’线所截的局部截面结构示意图。
图20为根据本公开实施例的另一示例中沿图1A所示AA’线所截的局部截面结构示意图。
图21为根据本公开实施例的另一示例中沿图1A所示AA’线所截的局部截面结构示意图。
图22至图26为不同示例提供的显示基板中的限定部的局部截面结构示意图。
图27为根据本公开实施例的另一示例中沿图1A所示AA’线所截的局部截面结构示意图。
图28为根据本公开实施例的另一示例中沿图1A所示AA’线所截的局部截面结构示意图。
图29为根据本公开另一实施例提供的显示基板。
图30为根据本公开另一实施例提供的显示装置的局部截面结构示意图。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例的附图，对本公开实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。基于所描述的本公开的实施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其它实施例，都属于本公开保护的范围。
除非另外定义，本公开使用的技术术语或者科学术语应当为本公开所属领域内具有一般技能的人士所理解的通常意义。本公开中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。“包括”或者“包含”等类似的词语意指出现该词前面的元件或者物件涵盖出现在该词后面列举的元件或者物件及其等同，而不排除其他元件或者物件。
本公开实施例中使用的“平行”、“垂直”以及“相同”等特征均包括严格意义的“平行”、“垂直”、“相同”等特征，以及“大致平行”、“大致垂直”、“大致相同”等包含一定误差的情况，考虑到测量和与特定量的测量相关的误差(例如，测量系统的限制)，表示在本领域的普通技术人员所确定的对于特定值的 可接受的偏差范围内。例如，“大致”能够表示在一个或多个标准偏差内，或者在所述值的10％或者5％内。在本公开实施例的下文中没有特别指出一个成分的数量时，意味着该成分可以是一个也可以是多个，或可理解为至少一个。“至少一个”指一个或多个，“多个”指至少两个。本公开实施例中的“同层”指同一材料在经过同一步骤(例如一步图案化工艺)后形成的多个膜层之间的关系。这里的“同层”并不总是指多个膜层的厚度相同或者多个膜层在截面图中的高度相同。
本公开实施例提供一种显示基板以及显示装置。该显示装置包括衬底基板以及位于衬底基板上的多个发光元件和像素限定图案。发光元件包括发光功能层以及沿垂直于衬底基板的方向位于发光功能层两侧的第一电极和第二电极，第一电极位于发光功能层与衬底基板之间；像素限定图案位于第一电极远离衬底基板一侧，像素限定图案包括多个开口以及围绕多个开口的限定部，发光元件至少部分位于开口中。至少一个发光元件还包括光转换层，光转换层被配置为使得一种颜色光入射到光转换层后出射另一种颜色光，光转换层位于第二电极远离衬底基板的一侧，且光转换层的至少部分位于开口内，光转换层中位于开口内的部分靠近衬底基板的表面比限定部的至少部分远离衬底基板的表面更靠近衬底基板。本公开实施例提供的显示基板中，将光转换层中位于开口内的部分靠近衬底基板的表面设置为比至少部分限定部远离衬底基板的表面更靠近衬底基板，可以尽量减少光转换层与发光功能层之间的距离，以提高光转换层对入射的光的转换效率。
下面结合附图对本公开实施例提供的显示基板以及显示装置进行描述。
图1A为根据本公开实施例的一示例提供的显示基板的局部平面结构示意图，图2为沿图1A所示的AA’所截的局部截面结构示意图。
如图1A和图2所示，显示基板包括衬底基板100以及位于衬底基板100上的多个发光元件200和像素限定图案300。发光元件200包括发光功能层230以及沿垂直于衬底基板100的方向位于发光功能层两侧的第一电极210和第二电极220，第一电极210位于发光功能层230与衬底基板100之间。上述垂直于衬底基板100的方向指垂直于衬底基板100的设置有发光元件200的主板面的方向，如图2所示的Z方向。
如图1A和图2所示，像素限定图案300位于第一电极210远离衬底基板100的一侧，像素限定图案300包括多个开口310以及围绕多个开口310的限 定部320，发光元件200至少部分位于开口310中。例如，限定部320可以采用透明材料形成，也可以采用黑色材料形成。上述发光元件至少部分位于开口中指每个发光元件的至少部分位于开口中。
如图1A和图2所示，至少一个发光元件200还包括光转换层240，光转换层240被配置为使得一种颜色光入射到光转换层240后出射另一种颜色光，光转换层240位于第二电极220远离衬底基板100的一侧，且光转换层240的至少部分位于开口310内，光转换层240中位于开口310内的部分靠近衬底基板100的表面比限定部320的至少部分远离衬底基板100的表面更靠近衬底基板100。
本公开实施例提供的显示基板中，将光转换层靠近衬底基板的表面设置为比至少部分限定部远离衬底基板的表面更靠近衬底基板，可以尽量减少光转换层与发光功能层之间的距离，以提高光转换层对入射的光的转换效率。
图1A仅示意性示出像素限定图案，以及像素限定图案的开口限定的发光元件的轮廓，没有具体示出像素限定图案远离衬底基板一侧的膜层以及发光元件中的膜层。
上述限定部远离衬底基板的表面指限定部最远离衬底基板位置的表面，该表面可以为平面，也可以为弧形面，该表面不包括限定部的侧表面。
本公开提供的显示基板中的光转换层不是一整层的膜层，该光转换层是位于像素限定图案的开口内的膜层。当然，本公开实施例不限于此，光转换层除了包括位于开口内的部分外，还可以包括位于部分限定部(如后续描述的第二子限定部)远离衬底基板一侧表面中的部分，但不同颜色发光元件的光转换层之间间隔设置，没有接触。
例如，如图2所示，限定部320在垂直于衬底基板100的方向上可以为一体化的结构。例如，限定部320仅包括一层结构。
例如，限定部320可以包括位于发出相同颜色光的发光元件200之间的部分以及位于发出不同颜色光的发光元件200之间的部分，上述限定部320的至少部分可以指位于发出不同颜色光的发光元件200之间的部分，也可以指位于发出相同颜色光的发光元件200之间的部分，或者各个位置的限定部320。
例如，如图2所示，平行于衬底基板100的平面穿过至少部分限定部320以及光转换层240。例如，光转换层240和至少部分限定部320在平行于衬底基板100的方向上交叠设置。例如，光转换层240在垂直于衬底基板100的平 面上的正投影与至少部分限定部320在该平面上的正投影交叠。
例如，发光元件200可以为有机发光二极管。例如，发光元件200可以为有机发光元件。例如，发光元件200可以为电致发光元件。例如，发光元件200可以对应显示基板上的子像素，例如一个子像素包括一个发光元件，或者一个子像素包括两个或两个以上发光元件。
例如，发光功能层230包括多个膜层，例如多个膜层可以包括空穴注入层(HIL)、空穴传输层(HTL)、发光层(EL)、电子传输层(ETL)和电子注入层(EIL)等膜层。例如，发光功能层230还可以包括空穴阻挡层(HBL)，电子阻挡层(EBL)，微腔调节层，激子调节层或其他功能膜层。例如，空穴注入层和空穴传输层位于发光层与第一电极210之间，电子传输层和电子注入层位于发光层与第二电极220之间。例如，空穴阻挡层位于发光层与第二电极220之间。例如，电子阻挡层位于发光层与第一电极210之间。例如，发光功能层还可以包括多个叠层的器件，例如第一叠层包括第一发光层，第二叠层包括第二发光层，第一叠层和第二叠层还可以包括空穴注入层(HIL)、空穴传输层(HTL)、发光层(EL)、电子传输层(ETL)和电子注入层(EIL)、空穴阻挡层，电子阻挡层，微腔调节层，激子调节层或其他功能膜层中的一层或多层，第一叠层和第二叠层之间可以包括电荷生成层(CGL),电荷生成层(CGL)可以包括n掺杂电荷生成层(CGL)，和/或p掺杂电荷生成层(CGL)。当然，为了进一步提高发光效率，发光功能层还可以包括三叠层或更多叠层。
例如，多个发光元件200包括发出相同颜色光的部分发光元件200以及发出不同颜色光的部分发光元件200，发出相同颜色光的发光元件200和发出不同颜色光的发光元件200可以共用第二电极220以及发光功能层230，发光功能层230可以为共通层，第二电极220也可以为共通层。
例如，发出不同颜色光的发光元件200的发光功能层230被配置为发出相同颜色光。例如，多个发光元件200包括被配置为发出红光的红色发光元件201、被配置为发出绿光的绿色发光元件202以及被配置为发出蓝光的蓝色发光元件203。例如，红色发光元件201的发光功能层、绿色发光元件202的发光功能层以及蓝色发光元件203的发光功能层均发出相同颜色的光。
例如，每个发光元件200的发光功能层230可以包括多层发光层，如发出相同波段的蓝光的多层发光层，或者发出不同波段的蓝光(如深蓝色的光和浅蓝色的光)的多层发光层，或者分别发出蓝光和绿光的多层发光层。
例如，发光功能层230可以包括三层蓝光发光层以及一层绿光发光层，绿光发光层位于三层蓝光发光层远离衬底基板的一侧。例如，相邻两层蓝光发光层之间可以设置依次层叠设置的电子传输层、电荷生成层以及空穴传输层。例如，蓝光发光层与绿光发光层之间可以设置依次层叠设置的电子传输层、电荷生成层以及空穴传输层。例如，绿光发光层中可以采用铂(Pt)掺杂。例如，位于电子传输层与空穴传输层之间的电荷生成层可以包括n型电荷生成层和p型电荷生成层，n型电荷生成层和p型电荷生成层之间可以增加功能层以调节载流子传输效率。
在一些示例中，发光功能层230包括热活化延迟荧光(TADF)材料，以提高发光功能层的发光效率，减少发光层的层叠层数，从而降低功耗。
例如，电子传输层的厚度可以为1～10纳米，例如为2～8纳米，例如为3～7纳米。例如，电子注入层的厚度可以为5～30纳米，例如为22～28纳米，例如为25～27纳米，例如5-15纳米，例如6-12纳米。
例如，第一电极210可以为阳极，第二电极220可以为阴极。例如，阴极可由高导电性和低功函数的材料形成，例如，阴极可采用金属材料制成。例如，阳极可由具有高功函数的导电材料形成。
例如，第一电极210和第二电极220的至少之一可以包括多层膜层。例如，第一电极210可以包括三层膜层，即第一电极层、第二电极层以及第三电极层。例如，第一电极210包括钨的氧化物(WO X)和铝(Al)的叠层。例如，第一电极层和第三电极层的材料可以包括钨的氧化物(WO X)，第二电极层的材料可以包括铝(Al)。
例如，第一电极210包括氧化铟锡(ITO)、银(Ag)和氧化铟锡(ITO)三叠层。例如，第一电极210包括氧化铟锡(ITO)、银(Ag)两叠层。例如，第一电极210包括氧化铟锡(ITO)、银(Ag)以及其他金属氧化物层(例如，WO X)。例如，第一电极包括的两叠层或三叠层中，至少两层是通过过孔连接。例如，在第一电极靠近发光层一侧的第一子层和第二子层之间具有绝缘层，第一子层和第二子层通过绝缘层过孔连接，即第一电极可以包括第一子层，绝缘层，第二子层。例如，第一电极可以包括第一子层，绝缘层，第二子层，以及第二子层远离绝缘层一侧的第三子层。例如，第一电极在靠近发光层一侧向远离发光层一侧的方向上分别包括第一子层，第二子层，第三子层，第二子层和第三子层之间具有绝缘层，第二子层和第三子层通过绝缘层过孔连接，即第一 电极可以包括第一子层，第二子层，绝缘层和第三子层。
例如，第二电极220可以包括一层或两层膜层。例如，第二电极220可以包括镁银合金。例如第二电极220可以包括第一电极层和第二电极层，其中，第一电极层位于第二电极层靠近发光层一侧。例如，第二电极220可以包括铟的氧化物(InO X)和银(Ag)或银合金的叠层。例如，第一电极层的材料可以包括铟的氧化物(InO X)，第二电极层的材料可以包括银(Ag)或银合金。
例如，第一电极210为反射电极，第二电极220为透光电极。例如，发光功能层230发出的光可以从第二电极220远离第一电极210一侧出射，并经过光转换层240以转换为另一种颜色光。
例如，像素限定图案300的限定部320为限定开口310的结构。例如，限定部320的材料可以包括聚酰亚胺、亚克力或聚对苯二甲酸乙二醇酯等。例如，限定部320交叉设置以限定开口310。
例如，像素限定图案300的开口310被配置为限定发光元件200的发光区。例如，多个发光元件200可以与多个开口310一一对应设置。例如，发光元件200可以包括位于开口310中的部分，以及在垂直于衬底基板100的方向与限定部320交叠的部分。
例如，发光元件200的至少部分位于开口310中。例如发光元件的第一电极210位于限定部320靠近衬底基板100一侧，且开口310被配置为暴露第一电极210，暴露的第一电极210至少部分与发光元件200中的发光功能层230接触。例如，第一电极210的至少部分位于限定部320与衬底基板01之间。例如，当发光功能层230位于像素限定图案300的开口310中时，位于发光功能层230两侧的第一电极210和第二电极220能够驱动像素限定图案300的开口310中的发光功能层230进行发光。例如，上述发光区可以指发光元件的有效发光的区域，发光区的形状指二维形状，例如发光区的形状可以与像素限定图案300的开口310的形状相同。例如像素限定图案300的开口可以为靠近衬底基板一侧尺寸小，远离衬底基板一侧尺寸大的形状。例如，发光区的形状可以与像素限定图案300的开口靠近衬底基板一侧的大小和形状大致相同。
例如，限定部320限定的开口310的至少部分用于限定光转换层240的出光区。
在一些示例中，如图1A和图2所示，多个发光元件200包括至少两种颜色的发光元件200，如第一发光元件201和第二发光元件202，至少两种颜色 的发光元件200的发光功能层230被配置为均发出第一颜色光，至少两种颜色的发光元件200中的至少一种颜色发光元件200包括光转换层240，且第一颜色光经过光转换层240后转换为第二颜色光。例如，第一颜色光的波长小于第二颜色光的波长。
例如，不同颜色发光元件的发光区的面积不同，如蓝色发光元件的发光区的面积可以大于红色发光元件和绿色发光元件至少之一的发光区的面积。
例如，第一发光元件201和第二发光元件202之一可以为蓝色发光元件、绿色发光元件或者红色发光元件，第一发光元件201和第二发光元件202的另一个可以为绿色发光元件、红色发光元件或者蓝色发光元件。
例如，第一颜色光可以为蓝光，第二颜色光可以为红光或者绿光。
例如，如图2所示，至少两种发出不同颜色光的发光元件200包括光转换层240。例如，红色发光元件和绿色发光元件可以均包括光转换层240。例如，第一发光元件201和第二发光元件202之一为红色发光元件，另一个为绿色发光元件。例如，红色发光元件的光转换层240将蓝光转换为红光，绿色发光元件的光转换层240将蓝光转换为绿光。
例如，如图2所示，第三发光元件203为蓝色发光元件，第三发光元件203包括透光功能层250，被配置为透过发光功能层230出射的第一颜色光，如蓝光。例如，透光功能层250可以包括散射粒子或者折射粒子，以增加出光率。
例如，如图2所示，透光功能层250中位于开口310内的部分靠近衬底基板100的表面比限定部320的至少部分远离衬底基板100的表面更靠近衬底基板100。例如，透光功能层250在垂直于衬底基板100的平面上的正投影与至少部分限定部320在该平面上的正投影交叠。例如，平行于衬底基板100的平面穿过至少部分限定部320以及透光功能层250。
在一些示例中，光转换层240包括量子点。本公开实施例不限于此，光转换层还可以包括荧光材料。例如，当第一颜色入射光入射到光转换层240后，光转换层240的材料受到第一颜色入射光激发而发射其他颜色的光，如第二颜色光。
在一些示例中，如图2所示，光转换层240位于开口310内的部分远离衬底基板100的表面比限定部320的至少部分远离衬底基板100的表面更靠近衬底基板100。例如，光转换层240可以完全位于至少限定部320限定的开口310内。
例如，如图2所示，透光功能层250位于开口310内的部分远离衬底基板100的表面比限定部320的至少部分远离衬底基板100的表面更靠近衬底基板100。例如，透光功能层250可以完全位于至少限定部320限定的开口310内。
例如，如图2所示，光转换层240靠近衬底基板100一侧的表面可以为平坦的表面。例如，透光功能层250靠近衬底基板100一侧的表面可以为平坦的表面。例如，发出不同颜色光的发光元件200中的光转换层240靠近衬底基板100一侧的表面可以位于同一表面。例如，光转换层240靠近衬底基板100一侧的表面与透光功能层250靠近衬底基板100一侧的表面可以位于同一表面。
在一些示例中，如图2所示，光转换层240位于开口310内的部分远离衬底基板100的表面的中心部分比边缘部分更靠近衬底基板100。例如，光转换层240位于开口310内的部分的远离衬底基板一侧的表面为凹陷的表面，且该凹陷的表面中边缘位置处最高点比限定部320远离衬底基板100一侧的表面更靠近衬底基板100。
例如，如图2所示，透光功能层250位于开口310内的部分远离衬底基板100的表面的中心部分比边缘部分更靠近衬底基板100。例如，透光功能层250位于开口310内的部分远离衬底基板100一侧表面可以为向衬底基板100凹陷的表面。
当然，本公开实施例不限于此，光转换层位于开口内的部分远离衬底基板一侧的表面可以比限定部远离衬底基板一侧的表面更远离衬底基板，或者光转换层位于开口内的部分远离衬底基板一侧的表面的部分位置可以与限定部远离衬底基板一侧的表面齐平。
例如，如图2所示，每个发光元件200中的光转换层240位于该发光元件200对应的开口内。例如，相邻且发光颜色不同的发光元件200的光转换层240彼此分隔。例如，相邻且发光颜色不同的发光元件200的光转换层240之间的距离大于限定部320的宽度。例如，透光功能层250与光转换层240彼此分隔。
例如，如图2所示，在垂直于衬底基板100的方向，发出不同颜色光的发光元件200的光转换层240的最小厚度可以相同，也可以不同。例如，在垂直于衬底基板100的方向，光转换层240的最小厚度与透光功能层250的最小厚度可以相同，也可以不同。
在一些示例中，如图2所示，显示基板还包括位于光转换层240与第二电极220之间的第一绝缘层400，第一绝缘层400中位于开口310内的部分的远 离衬底基板100的表面比限定部320的至少部分远离衬底基板100的表面更靠近衬底基板100。
例如，第一绝缘层400可以为封装层，以对发光元件的发光功能层和第二电极进行封装。例如，封装层远离衬底基板100一侧的表面到衬底基板100之间的距离d1与限定部320的至少部分远离衬底基板100一侧的表面到衬底基板100之间的距离d2差至少5微米。例如，上述距离d1与距离d2之差可以为5.5微米。例如，上述距离d1与距离d2之差可以为6微米。例如，上述距离d1与距离d2之差可以为6.5微米。例如，上述距离d1与距离d2之差可以为7微米。例如，上述距离d1与距离d2之差可以为7.5微米。例如，上述距离d1与距离d2之差可以为8微米。例如，上述距离d1与距离d2之差可以为8.5微米。例如，上述距离d1与距离d2之差可以为9微米。例如，上述距离d1与距离d2之差可以为9.5微米。例如，上述距离d1与距离d2之差可以为10微米。
例如，如图2所示，第一绝缘层400覆盖限定部320以及开口310，且光转换层240位于开口310内的第一绝缘层400上。例如，第一绝缘层400位于开口310内的部分远离衬底基板100一侧的表面为平坦的表面。
例如，如图2所示，光转换层240与发光功能层230之间仅设置有第二电极220以及第一绝缘层400，由此可以极大地减小光转换层与发光功能层之间的距离。
例如，光转换层240与发光功能层230之间的距离小于5微米。例如，光转换层240与发光功能层230之间的距离小于4.8微米。例如，光转换层240与发光功能层230之间的距离小于4.5微米。例如，光转换层240与发光功能层230之间的距离小于4.2微米。例如，光转换层240与发光功能层230之间的距离小于4微米。例如，光转换层240与发光功能层230之间的距离小于3.7微米。例如，光转换层240与发光功能层230之间的距离小于3.5微米。例如，光转换层240与发光功能层230之间的距离小于3.3微米。例如，光转换层240与发光功能层230之间的距离小于3微米。
在一些示例中，如图2所示，第一绝缘层400的厚度小于限定部320的至少部分的厚度。例如，第一绝缘层400的厚度与限定部320的厚度之差至少为1微米。例如，第一绝缘层400的厚度与限定部320的厚度之差至少为1.5微米。例如，第一绝缘层400的厚度与限定部320的厚度之差至少为2微米。例 如，第一绝缘层400的厚度与限定部320的厚度之差至少为2.5微米。例如，第一绝缘层400的厚度与限定部320的厚度之差至少为3微米。例如，第一绝缘层400的厚度与限定部320的厚度之差至少为4微米。例如，第一绝缘层400的厚度与限定部320的厚度之差至少为5微米。
例如，如图2所示，发光功能层230、第二电极220以及第一绝缘层400的总厚度小于限定部320的厚度，以使得光转换层240可以形成在限定部320限定的开口310内。
在一些示例中，如图2所示，第一绝缘层400包括至少两层膜层，如膜层410和膜层420，且不同膜层的厚度差小于1微米。例如，不同膜层的厚度差小于0.9微米。例如，不同膜层的厚度差小于0.8微米。例如，不同膜层的厚度差小于0.7微米。例如，不同膜层的厚度差小于0.6微米。例如，不同膜层的厚度差小于0.5微米。例如，不同膜层的厚度差小于0.4微米。
例如，第一绝缘层400可以包括至少两层无机绝缘层。例如，第一绝缘层400包括的各膜层可以均为无机层。例如，第一绝缘层400包括的各膜层可以均含有硅(Si)。
在第一绝缘层作为封装层时，通过仅设置厚度较薄的无机绝缘层，可以尽可能保留开口的深度，以在开口中形成，如打印光转换层。当然，本公开实施例不限于此，第一绝缘层还可以包括有机绝缘层。
例如，限定部320被垂直于衬底基板100的平面(如XZ面)所截的限定部截面可以为梯形，且梯形斜边与下底之间的角度较小，如不大于45度，有利于增加限定发光功能层的最大开口与限定光转换层的最大开口的比例。
图3为根据本公开实施例的一示例沿图1A所示BB’线所截的局部截面结构示意图，图4A为沿图1A所示CC’所截的局部截面结构示意图。
在一些示例中，如图1A至图4A所示，多个发光元件200包括至少两种颜色的发光元件200，如第一发光元件201、第二发光元件202以及第三发光元件203，位于相邻不同颜色的发光元件200对应的开口310之间的限定部320包括第一子限定部321，位于相邻且相同颜色的发光元件200对应的开口310之间的限定部320包括第二子限定部322，第一子限定部321的最大厚度大于第二子限定部322的最大厚度，第二电极220中覆盖第二子限定部322的部分连续设置。
上述第二电极220中覆盖第二子限定部322的部分连续设置指覆盖第二子 限定部322远离衬底基板100一侧的表面和覆盖第二子限定部322侧表面的第二电极220是连续的结构。例如，第二电极220覆盖至少两个发光元件的部分为连续的结构。
例如，第一子限定部321的最大厚度与第二子限定部322的最大厚度之差至少为1微米。例如，第一子限定部321的最大厚度与第二子限定部322的最大厚度之差为2微米。例如，第一子限定部321的最大厚度与第二子限定部322的最大厚度之差至少为3微米。例如，第一子限定部321的最大厚度与第二子限定部322的最大厚度之差至少为4微米。例如，第一子限定部321的最大厚度与第二子限定部322的最大厚度之差至少为5微米。例如，第一子限定部321的最大厚度与第二子限定部322的最大厚度之差至少为6微米。例如，第一子限定部321的最大厚度与第二子限定部322的最大厚度之差至少为7微米。
例如，如图1A至图4A所示，限定部320包括围绕多个发光元件200的一圈环状限定部323，该环状限定部323的最大厚度大于第二子限定部322的最大厚度，以将光转换层240限定在像素限定图案300开口310内，防止光转换层240溢出限定部320。例如，环状限定部323的最大厚度与第一子限定部321的最大厚度相同，但不限于此，环状限定部的最大厚度可以大于第一子限定部的最大厚度，也可以小于第一子限定部的最大厚度。
例如，如图2和图4A所示，第一子限定部321的远离衬底基板100一侧的表面包括的斜坡的坡度角与第二子限定部322的远离衬底基板100一侧的表面包括的斜坡的坡度角相等。当然，本公开实施例不限于此，第一子限定部的远离衬底基板一侧的表面包括的斜坡的坡度角可以大于第二子限定部的远离衬底基板一侧的表面包括的斜坡的坡度角，以提高第二电极在覆盖第二子限定部位置处的连续性。
例如，如图3所示，光转换层240覆盖第二子限定部322远离衬底基板100一侧的表面，如光转换层240在第二子限定部322处为连续结构。例如，光转换层240包括位于相邻第二子限定部322限定的开口之间的部分以及覆盖第二子限定部322的部分。
例如，如图3所示，光转换层240远离衬底基板100一侧的表面比第二子限定部322远离衬底基板100一侧的表面更远离衬底基板100。例如，光转换层240位于第二子限定部322上的部分远离衬底基板100一侧表面比第一子限定部321远离衬底基板100一侧表面更靠近衬底基板100。
例如，如图4A所示，在第二子限定部322的最大厚度小于第一子限定部321的最大厚度时，相邻第一子限定部321之间形成的开口用于限定光转换层240的位置，防止光转换层240溢出限定部320。此时，光转换层240可能覆盖第二子限定部322。例如，相邻且颜色相同的发光元件200的光转换层240可以为连续结构，相邻且颜色不同的发光元件200的光转换层240之间设置有第一子限定部321以实现两者间隔设置。
图2示意性示出覆盖多个第一子限定部321的第二电极220为连续设置的膜层，但实际产品中，第一子限定部321的厚度设置的较大以形成容纳光转换层240的开口310时，第二电极220容易在第一子限定部321的边缘处断开，导致覆盖相邻且不同颜色发光元件200之间的限定部320的第二电极220是非连续膜层而影响显示效果。本公开实施例的一示例提供的显示基板中，通过将限定部设置为具有至少两种不同厚度的子限定部，在厚度较小位置处保证第二电极的连续性，以提高显示基板的显示效果。
图1B为根据本公开实施例的一示例提供的显示基板的局部平面结构示意图，图4B为沿图1B所示C1C1’所截的局部截面结构示意图。图1B所示显示基板与图1A所示显示基板的不同之处在于像素限定图案的开口的形状不同以及第二子限定部的宽度不同。
例如，如图1B和图4B所示，第一子限定部321可以与第二子限定部322为一体形成的结构，也可以为分别形成的结构。例如，在第二子限定部322仅包括厚度较小的部分，第一子限定部321包括与第二子限定部322厚度相同的部分(如虚线以下的部分)以及超出第二子限定部322的部分(如虚线以上的部分)。例如，第一子限定部321与第二子限定部322连接的位置处可以为弧面，以使第一子限定部321和第二子限定部322形成的凹陷部被XZ面所截的截面可以为U形或者V形。
图5为根据本公开实施例的另一示例沿图1A所示DD’线所截的局部截面结构示意图。图5所示显示基板与图3所示显示基板的不同之处在于：第一子限定部321远离衬底基板100的一侧表面包括第一斜坡3210，第二子限定部322远离衬底基板100的一侧表面包括第二斜坡3220，第一斜坡3210的坡度角α1大于第二斜坡3220的坡度角α1。图5所示显示基板中的衬底基板、第一绝缘层、发光功能层、第一电极等结构可以与图3所示显示基板中的衬底基板、第一绝缘层、发光功能层、第一电极等结构具有相同的特征，在此不再赘述。
上述第一子限定部远离衬底基板的一侧表面形成的第一斜坡的坡度角为第一子限定部靠近衬底基板的部分表面与平行于衬底基板的平面之间的角度，上述第二子限定部远离衬底基板的一侧表面形成的第二斜坡的坡度角为第二子限定部靠近衬底基板的部分表面与平行于衬底基板的平面之间的角度。上述第一子限定部的坡度角可以指第一斜坡被XZ面所截的形状为直线或曲线，该直线与第一电极接触位置的夹角，或者该曲线与第一电极的交点处与X方向之间的夹角，上述第二子限定部的坡度角可以指第二斜坡被YZ面所截的形状为直线或曲线，该直线与第一电极接触位置的夹角，或者该曲线与第一电极的交点处与Y方向之间的夹角，但不限于此，例如，上述坡度角可以指斜坡被XZ面(或YZ面)所截的曲线中点处切线与X方向(或Y方向)之间的夹角。
图5所示示例中的显示基板中，通过将第二子限定部的坡度角设置为小于第一子限定部的坡度角，以实现覆盖第二子限定部的连续性，提高显示基板的显示效果。
例如，如图5所示，第二子限定部322的最大厚度较大以实现相邻且相同颜色发光元件200的光转换层240的间隔设置。例如，第二子限定部322远离衬底基板100一侧的表面比光转换层240靠近衬底基板100一侧的表面更远离衬底基板100。例如，第二子限定部322远离衬底基板100一侧的表面可以比光转换层240远离衬底基板100一侧的表面更远离衬底基板100，也可以比光转换层240远离衬底基板100一侧的表面平齐，或者比光转换层240远离衬底基板100一侧的表面更靠近衬底基板100，本公开实施例对此不作限制，可以根据第二电极连续性情况进行设置。
在一些示例中，如图1A至图5所示，沿第一方向排列的相邻的至少两个发光元件200发光颜色相同，沿第二方向排列的相邻的至少两个发光元件200的发光颜色不同，第一方向与第二方向相交。图1A至图5示意性的示出第一方向为Y方向，第二方向为X方向。但不限于此，第一方向与第二方向可以互换。例如，第一方向与第二方向垂直，但不限于此，第一方向与第二方向之间的夹角可以为70～110度，或者80～100度，或者85～95度。例如，第一方向和第二方向之一为行方向，另一个为列方向。
在一些示例中，如图1A至图5所示，限定部320包括多个第一子限定部321和多个第二子限定部322，至少一个第一子限定部321沿第一方向延伸，且相邻两个第一子限定部321之间设置有沿第二方向延伸的第二子限定部 322。例如，相邻两个第一子限定部321之间设置的第二子限定部322彼此平行设置。例如，图1A示意性的示出限定部320限定的开口310的形状可矩形，但不限于此，开口310的形状还可以为图1B所示的长条形，或者其他形状，如椭圆形、圆形、梯形等。
例如，第一子限定部321与第二子限定部322可以为在同一步工艺中形成的一体化设置的结构，也可以为分步骤形成的结构。例如，环状限定部323可以与第一子限定部321和第二子限定部322为在同一步工艺中形成的一体化设置的结构，也可以为分步骤形成的结构。
在一些示例中，如图1A和图3所示，显示基板还包括信号传输线500，位于第一电极210面向衬底基板100的一侧。显示基板包括显示区101以及围绕显示区101的周边区102，信号传输线500位于周边区102。例如，信号传输线500可以为围绕显示区101的一圈走线。
在一些示例中，如图1A和图3所示，显示基板还包括传输部510，位于第一电极210面向衬底基板100的一侧，且与信号传输线500电连接，传输部510位于限定部320中最边缘的部分靠近显示区101的一侧，且第二电极220与传输部510电连接。例如，限定部320的最边缘的部分可以为环状限定部323。
例如，如图1A和图3所示，信号传输线500被配置为向第二电极220传输VSS信号，如负电压信号。
例如，如图1A和图3所示，第二电极220的边界超出发光功能层230的边界，第二电极220的超出发光功能层230的边界的部分与传输部510电连接。
例如，如图1A和图3所示，环状限定部323和与其最近且间隔设置的第二子限定部322之间设置有一开口3100，该开口3100不设置发光元件。
例如，如图1A和图3所示，位于该开口3100中的第二电极220与传输部510电连接。例如，传输部510与该开口3100正对设置。
例如，如图1A和图3所示，该开口3100内可以设置部分发光功能层230，也可以不设置发光功能层230。例如，该开口3100内，第二电极220的至少部分不与发光功能层230交叠。例如，该开口3100内的第二电极220不与发光功能层230交叠的部分与传输部510电连接。
例如，如图1A和图3所示，该开口3100内可以设置与第一电极210同层设置的电极连接部501，第二电极220可以通过电极连接部501与传输部510电连接。当然，本公开实施例不限于此，该开口内也可以不设置与第一电极210 同层设置的电极连接部，第二电极通过绝缘层中的过孔与传输部510电连接。
本公开实施例通过将位于像素限定图案中心区域的部分限定部的厚度设置为小于像素限定图案边缘的限定部的厚度，且将与第二电极电连接的信号传输线的传输部设置为位于边缘的限定部的至少部分位置靠近厚度较小的限定部的一侧，可以在实现显示区内至少部分区域设置的第二电极连续设置的同时，将该部分连续设置的第二电极与上述传输部电连接以实现第二电极良好的电连接效果。
例如，显示基板还包括与发光元件电连接的像素电路以驱动发光元件发光，显示基板还包括与像素电路电连接的数据线，数据线位于发光元件的第一电极与衬底基板之间，信号传输线可以与数据线同层设置。
例如，传输部510可以与信号传输线500同层设置，如传输部510可以为信号传输线500的一部分。
例如，传输部510可以位于信号传输线500所在膜层与发光元件200的第一电极210所在膜层之间。例如，传输部510可以与第一电极210的至少部分同层设置。例如，传输部510可以位于发光元件200的第二电极220所在膜层与第一电极210所在膜层之间。
图2、图4A以及图5没有示出第一电极210与衬底基板100之间的膜层，图3仅示意出传输部510以及位于传输部510与第一电极210之间的绝缘层，而第一电极210与衬底基板100之间的其他膜层没有示出。
图6为根据本公开实施例的另一示例提供的显示基板的局部平面结构示意图，图7为沿图6所示EE’线所截的局部截面结构示意图。图6所示示例中的显示基板与图1A所示显示基板的不同之处在于限定部320的结构特征不同，图6所示示例中的显示基板包括的衬底基板100、发光元件200以及第一绝缘层400可以与图1A所示示例中的显示基板包括的衬底基板100、发光元件200以及第一绝缘层400具有相同的特征，这里不再赘述。
在一些示例中，如图6和图7所示，显示基板还包括电极搭接部520，电极搭接部520位于限定部320面向衬底基板100的一侧，且沿垂直于衬底基板100的方向，限定部320与电极搭接部520交叠。限定部320包括暴露电极搭接部520的开孔或开槽324，第二电极220通过开孔或开槽324与电极搭接部520电连接。
例如，开槽324或开孔内包括碳元素，如开槽324或开孔内还可以包括氧 元素等。
例如，第二电极220与电极搭接部520的实际接触的面积小于开槽324的宽度，或者小于开孔的最大尺寸。
例如，图6所示示例中的电极搭接部520可以与图1A所示示例中的传输部510具有相同的作用，如将第二电极220与信号传输走线500电连接，上述电极搭接部520与传输部510可以具有相同的结构特征，也可以具有不同的结构特征，本公开实施例对此不作限制。例如，电极搭接部也可以称为辅助阴极。
在一些示例中，如图6和图7所示，至少部分电极搭接部520的延伸方向与至少部分限定部320的延伸方向相同。例如，电极搭接部520与沿第一方向延伸的限定部320交叠，则该电极搭接部520沿第一方向延伸。例如，电极搭接部520与沿第二方向延伸的限定部320交叠，则该电极搭接部520沿第二方向延伸。
例如，至少部分电极搭接部520与至少部分限定部320交叠。例如，限定部320覆盖电极搭接部520的边缘。
例如，围绕一个开口的至少一侧的电极搭接部520在衬底基板100上的正投影位于限定部320在衬底基板100上的正投影内，可以缓解显示基板各位置电压降导致的不均匀。
例如，如图6和图7所示，限定部320中开槽324的延伸方向与限定部320的延伸方向相同，且开槽324的延伸方向与被其暴露的电极搭接部520的延伸方向相同。
例如，如图6所示，限定部320包括沿第一方向延伸且沿第二方向排列的多个第一子限定部321以及位于相邻第一子限定部321之间的沿第二方向延伸的第二子限定部322，相邻第一子限定部321之间设置的多个第二子限定部322沿第一方向排列。例如，沿第二方向排列的第二子限定部322位于一条直线上。
例如，一个第一子限定部321中设置的开槽324可以沿第一方向贯穿该第一子限定部321，也可以仅位于该第一子限定部321中的部分位置，没有贯穿该第一子限定部321。例如，一个第一子限定部321中可以设置一条沿第一方向延伸的开槽324，也可以设置多条开槽324，多条开槽324可以如图6所示沿第一方向延伸且沿第二方向排列，也可以沿第一方向延伸且沿第一方向间隔排列。
例如，一个第二子限定部322中设置的开槽324可以沿第二方向贯穿该第 二子限定部322，也可以仅位于该第二子限定部322中的部分位置，没有贯穿该第二子限定部322。例如，一个第二子限定部322中可以设置一条沿第二方向延伸的开槽324，也可以设置多条开槽324，多条开槽324可以如图6所示沿第二方向延伸且沿第一方向排列，也可以沿第二方向延伸且沿第二方向间隔排列。例如，沿第二方向排列的相邻两个第二子限定部322之间设置有一个第一子限定部321，第二子限定部322中设置的开槽324可以贯通第一子限定部321，也可以仅位于第二子限定部322中，如没有贯通第二子限定部322，如与第一子限定部321之间设置有间隔。
例如，图6示意性的示出每个第一子限定部321和每个第二子限定部322均设置开槽324，且每个子限定部中设置有两个开槽324，环状限定部323中没有设置开槽，但本公开实施例不限于此，例如，本公开实施例的一示例中，仅第一子限定部设置开槽，第二子限定部和环状限定部没有设置开槽；例如，本公开实施例的一示例中，仅第二子限定部设置开槽，第一子限定部和环状限定部没有设置开槽；例如，本公开实施例的一示例中，某一区域的第一子限定部和第二子限定部设置有开槽，其他区域的第一子限定部没有设置开槽；例如，本公开实施例的一示例中，某一区域第一子限定部设置有开槽，其他区域第二子限定部设置开槽。例如，第一子限定部和第二子限定部形成的开槽可以形成联通的网格状。
例如，不同第一子限定部中设置的开槽的数量可以相同，也可以不同。例如，不同第二子限定部中设置的开槽的数量可以相同，也可以不同。例如，一个第一子限定部中设置的开槽的数量与一个第二子限定部中设置的开槽的数量可以相同，也可以不同。
例如，如图7所示，开槽324中仅设置第二电极220。例如，图案化形成的限定部230设置有开槽324，在形成发光功能层230后，开槽324中填充了发光功能层；在形成第二电极220之前，采用激光去除开槽324内的至少部分发光功能层230，以使开槽324暴露电极搭接部520，第二电极220的部分形成在开槽324中以与电极搭接部520连接。
在一些示例中，如图6和图7所示，显示基板还包括信号传输线500，位于第一电极210面向衬底基板100的一侧。显示基板包括显示区以及围绕显示区的周边区(参考图1A所示的显示区101和周边区102)，信号传输线500位于周边区，第二电极220通过电极搭接部520与信号传输线500电连接。
例如，如图6和图7所示，电极搭接部520延伸至周边区以与信号传输线500电连接。例如，电极搭接部520可以形成为网格状。
例如，如图6和图7所示，以第一子限定部321为例，每个第一子限定部321设置有两个开槽324，两个开槽324将每个第一子限定部321划分三个部分，第一子限定部321中，位于中间的一部分的最大厚度大于位于两侧的两部分的最大厚度。例如，第一子限定部321中，位于中间的一部分的远离衬底基板100一侧的表面比光转换层240远离衬底基板100一侧的表面更远离衬底基板100，位于两侧的两部分中的至少一部分的远离衬底基板100一侧的表面比光转换层240远离衬底基板100一侧的表面更靠近衬底基板100。
例如，如图6和图7所示，光转换层240覆盖第一子限定部321中位于两侧的两部分中的至少一部分。例如，第一子限定部321中位于两侧的两部分的最大厚度可以相同，也可以不同。例如，第二子限定部322可以设置有与第一子限定部321具有相同特征的三部分。当然，本公开实施例不限于各子限定部中设置图7所示的三部分，在开槽数量为1个时，各子限定部可以包括两部分，两部分的最大厚度可以相同，也可以不同；在开槽数量为1个时，各子限定部可以包括两部分，两部分中的至少一个部分可以设置为台阶结构，该台阶结构中位于中间的部分最大厚度更大；在开槽数量为3个时，各子限定部可以包括四部分，其中位于中间的至少一个部分的最大厚度大于位于边缘的至少一个部分的最大厚度。
本公开实施例提供的显示基板中，通过在像素限定图案的限定部中设置开槽以使发光元件的第二电极通过开槽与电极搭接部电连接，有利于提高第二电极与电极搭接部的电连接效果。此外，通过将限定部中的至少一个子限定部设置为三部分，中间部分的最大厚度大于两侧的两部分的最大厚度，有利于实现限定部限定的开口中填充了光转换层的同时，第二电极具有良好的连续性。
在一些示例中，如图7所示，电极搭接部520包括至少一层与第一电极210同层设置的膜层。例如，第一电极210可以包括多层膜层，电极搭接部520可以为一层膜层，电极搭接部520可以与第一电极210中的一层膜层在同一步图案化工艺中形成。
例如，如图7所示，电极搭接部520与第一电极210间隔且绝缘设置。
图8A为沿图6所示FF’线所截的局部截面结构示意图，图8B为沿图8A所示F1区域局部放大意图。
在一些示例中，如图6至图8A所示，发光颜色不同的发光元件200之间的限定部320的最大厚度与发光颜色相同的发光元件200之间的限定部320的最大厚度的比值为0.8～1。例如，发光颜色不同的发光元件200之间的限定部320的最大厚度与发光颜色相同的发光元件200之间的限定部320的最大厚度的比值为0.85～0.88。例如，发光颜色不同的发光元件200之间的限定部320的最大厚度与发光颜色相同的发光元件200之间的限定部320的最大厚度的比值为0.9～0.95。例如，发光颜色不同的发光元件200之间的限定部320的最大厚度与发光颜色相同的发光元件200之间的限定部320的最大厚度的比值为0.92～0.97。例如，发光颜色不同的发光元件200之间的限定部320的最大厚度与发光颜色相同的发光元件200之间的限定部320的最大厚度相同。
例如，如图6至图8A所示，发光颜色不同的发光元件200之间的限定部320为第一子限定部321，发光颜色相同的发光元件200之间的限定部320为第二子限定部322，第一子限定部321的最大厚度与第二子限定部322的最大厚度之比为0.8～1。例如，第一子限定部321的最大厚度与第二子限定部322的最大厚度之比为0.9～0.95。例如，第一子限定部321的最大厚度与第二子限定部322的最大厚度之比为0.92～0.97。例如，第一子限定部321的最大厚度与第二子限定部322的最大厚度相同。
本公开实施例提供的显示基板中，可以在第一方向延伸的限定部与第二方向延伸的限定部的最大厚度基本相同的同时，通过在限定部中设置暴露电极搭接部的开槽，使得第二电极通过开槽与电极搭接部电连接，以实现第二电极与信号传输线之间具有良好的电连接效果。
例如，如图8B所示，位于中间限定部031上的第二电极220与位于两侧限定部032上的第二电极220为断开的结构，通过在中间限定部031与两侧限定部032之间设置开槽324，且在形成第二电极220之前将开槽324中的发光功能层230去除，可以使得第二电极220可以形成在开槽324内，以与电极搭接部520电连接。
例如，同图8B所示示例相同，图7、图9至图15所示限定部中，位于中间限定部上的第二电极220与位于两侧限定部上的第二电极220为断开的结构，通过在中间限定部与两侧限定部之间设置开槽324，且在形成第二电极220之前将开槽324中的发光功能层230去除，可以使得第二电极220可以形成在开槽324内，以与电极搭接部520电连接。
图9为根据本公开实施例另一示例沿图6所示EE’线所截的局部截面结构示意图。图9所示示例中的显示基板与图7所示示例中的显示基板的不同之处在于电极搭接部520的结构不同。图9所示示例中的显示基板中的衬底基板、发光元件、像素限定图案、第一绝缘层等结构可以与图7所示示例中的显示基板中的衬底基板、发光元件、像素限定图案、第一绝缘层等结构具有相同的特征，在此不再赘述。
在一些示例中，如图8A所示，电极搭接部520包括多层膜层，且电极搭接部520远离衬底基板100一侧的表面与衬底基板100之间的距离大于第一电极210远离衬底基板100一侧的表面与衬底基板100之间的距离。例如，电极搭接部520的厚度大于第一电极210的厚度。
本公开实施例提供的显示基板中，通过将电极搭接部的厚度设置为大于第一电极的厚度以方便第二电极通过开槽与电极搭接部电连接，有利于降低第二电极的电阻。
在一些示例中，如图8A所示，电极搭接部520包括位于第一电极210远离衬底基板100的一侧的膜层。例如，电极搭接部520包括与第一电极210同层的膜层以及位于第一电极210远离衬底基板100一侧的膜层。例如，电极搭接部520中与第一电极210同层设置的膜层可以与第一电极210在同一步图案化工艺中形成。
图10为根据本公开实施例另一示例沿图6所示EE’线所截的局部截面结构示意图。图10所示示例中的显示基板与图7所示示例中的显示基板的不同之处在于电极搭接部520的位置不同。图10所示示例中的显示基板中的衬底基板、发光元件以及像素限定图案等结构与图7所示衬底基板以及发光元件以及像素限定图案等结构具有相同的特征，在此不再赘述。
例如，如图10所示，电极搭接部520位于第一电极210与衬底基板100之间。
例如，如图10所示，显示基板还包括与发光元件200的第一电极210电连接的像素电路，包括发光控制晶体管，如发光控制晶体管包括有源层261、栅极264、源极262和漏极263，漏极263与发光元件200的第一电极210电连接。例如，电极搭接部520与源极262同层设置。
例如，如图10所示，显示基板还包括第一栅极绝缘层103、第二栅极绝缘层104、层间绝缘层105、钝化层106以及平坦层600。例如，平坦层600设置 有与开槽324对应的过孔或者槽601。
在一些示例中，如图10所示，平坦层600位于发光元件200的第一电极210与衬底基板100之间。
例如，电极搭接部520可以包括多层膜层，多层膜层可以包括与第一电极210同层设置的膜层，以及与发光控制晶体管的源极同层设置的膜层。
图11为根据本公开实施例另一示例沿图6所示EE’线所截的局部截面结构示意图。图11所示示例中的显示基板与图10所示示例中的显示基板的不同之处在于电极搭接部520的位置不同，且平坦层600的结构不同。图11所示示例中的显示基板中的衬底基板、发光元件以及像素限定图案等结构与图10所示衬底基板以及发光元件以及像素限定图案等结构具有相同的特征，在此不再赘述。
在一些示例中，如图11所示，平坦层600包括平坦层凸出部610，平坦层凸出部610在衬底基板100上的正投影与电极搭接部520在衬底基板100上的正投影交叠以使电极搭接部520远离衬底基板100一侧的表面与衬底基板100之间的距离大于第一电极210远离衬底基板100一侧的表面与衬底基板100之间的距离。通过在平坦层中设置平坦层凸出部可以垫高电极搭接部的位置，有利于发光元件的第二电极与电极搭接部的搭接。
例如，如图11所示，沿垂直于衬底基板100的方向，平坦层凸出部610与发光元200的发光区没有交叠。
图12为根据本公开实施例另一示例沿图6所示EE’线所截的局部截面结构示意图。图12所示示例中的显示基板与图11所示示例中的显示基板的不同之处在于平坦层600的结构不同。图12所示显示基板中电极搭接部的位置可以与图11所示显示基板中电极搭接部的位置相同，也可以与图7至图10所示任一示例中的显示基板中电极搭接部的位置相同，本示例对此不作限制。图12所示示例中的显示基板中的衬底基板、发光元件以及像素限定图案等结构与图10所示衬底基板以及发光元件以及像素限定图案等结构具有相同的特征，在此不再赘述。
在一些示例中，如图12所示，平坦层600包括凹槽620，沿垂直于衬底基板100的方向，限定部320与凹槽620没有交叠。至少部分发光元件200的第一电极210和发光功能层230位于凹槽620内，且发光功能层230靠近衬底基板100一侧的表面比电极搭接部520远离衬底基板100一侧的表面更靠近衬底 基板100。
例如，平坦层设置凹槽的位置与没有设置凹槽为位置的厚度之比可以为0.1～0.9。例如，平坦层设置凹槽的位置与没有设置凹槽为位置的厚度之比可以为0.15～0.7。例如，平坦层设置凹槽的位置与没有设置凹槽为位置的厚度之比可以为0.2～0.85。例如，平坦层设置凹槽的位置与没有设置凹槽为位置的厚度之比可以为0.25～0.75。例如，平坦层设置凹槽的位置与没有设置凹槽为位置的厚度之比可以为0.3～0.85。例如，平坦层设置凹槽的位置与没有设置凹槽为位置的厚度之比可以为0.4～0.5。例如，平坦层设置凹槽的位置与没有设置凹槽为位置的厚度之比可以为0.35～0.65。例如，平坦层设置凹槽的位置与没有设置凹槽为位置的厚度之比可以为0.55～0.6。
本公开实施例提供的显示基板，通过在平坦层中设置凹槽，且将电极搭接部设置在相邻凹槽之间的间隔处，相当于将电极搭接部的位置设置的较高，有利于发光元件的第二电极与电极搭接部的搭接。
例如，如图12所示，发光功能层230远离衬底基板100一侧表面可以比电极搭接部520远离衬底基板100一侧表面更远离衬底基板100。
图13为根据本公开实施例另一示例沿图6所示EE’线所截的局部截面结构示意图。图13所示示例中的显示基板与图12所示示例中的显示基板的不同之处在于平坦层600中的凹槽620的深度不同。图13没有示意出平坦层600与衬底基板100之间的膜层，图13中平坦层600与衬底基板100之间设置的膜层可以参考图12所示平坦层600与衬底基板100之间设置的膜层。
例如，如图13所示，发光功能层230远离衬底基板100一侧表面的至少部分可以比电极搭接部520远离衬底基板100一侧表面更靠近衬底基板100。例如，发光功能膜层230包括的多个膜层的至少部分膜层比电极搭接部520更靠近衬底基板100。例如，第二电极220位于凹槽620中的至少部分比电极搭接部520更靠近衬底基板100。
例如，如图13所示，沿垂直于衬底基板100的方向，像素限定图案的开口310与凹槽620交叠。例如，光转换层240在平坦层600上的正投影的至少部分位于凹槽620内。例如，光转换层240在平坦层600上的正投影完全位于凹槽620内。
例如，图13所示示例提供的显示基板中限定部320的最大厚度可以小于图7至图12所示示例提供的显示基板中限定部320的最大厚度。
本公开实施例的一示例中，通过在平坦层中设置凹槽，且将发光功能层的至少部分膜层远离衬底基板一侧表面设置为比电极搭接部远离衬底基板一侧表面更靠近衬底基板，可以在实现光转换层完全位于限定部限定的开口内的同时，尽量降低限定部的高度，以提高第二电极的连续性。
图14和图15为根据本公开实施例不同示例沿图6所示EE’线所截的局部截面结构示意图。图14和图15所示示例中的显示基板与图13所示示例中的显示基板的不同之处在于平坦层600中的凹槽620中设置有透明补偿结构630。图14和图15所示示例中的显示基板的不同之处在于透明补偿结构630的位置不同。图14和图15所示显示基板中的衬底基板、第一绝缘层、发光功能层、像素限定图案、第一电极等结构可以与图13所示显示基板中的衬底基板、第一绝缘层、发光功能层、像素限定图案、第一电极等结构具有相同的特征，在此不再赘述。
在一些示例中，如图14和图15所示，显示基板还包括透明补偿结构630，位于光转换层240与凹槽620底部之间。
本示例提供的显示基板中，通过在凹槽与光转换层之间填充透明补偿结构，可以尽量使得光转换层形成在一个较为平坦的表面上，以提高形成在凹槽内的光转换层的平坦度，提高显示效果。
例如，如图14所示，透明补偿结构630可以位于第一电极210与平坦层600之间。
例如，如图15所示，透明补偿结构630可以位于光转换层240与第二电极210之间。
例如，如图15所示，透明补偿结构630可以为第一绝缘层400中的一部分膜层，如第一绝缘层400可以为封装层，该封装层中位于凹槽620的部分的厚度大于位于凹槽620以外位置处的厚度。例如，位于凹槽620内的封装层可以包括有机封装层。
例如，透明补偿结构630也可以为透镜。
当然，本公开实施例不限于在凹槽中填充透明补偿结构以提高光转换层的中间部分的平坦度，还可以通过分层形成光转换层以提高光转换层的中间部分的平坦度。
在一些示例中，如图13至图15所示，凹槽620的侧壁621倾斜设置，且侧壁621中远离衬底基板100的部分比靠近衬底基板100的部分更远离凹槽 620内设置的发光元件的发光区的中心。例如，凹槽620的侧壁向外侧倾斜。上述外侧指凹槽围绕的发光元件中心指向边缘一侧。
例如，凹槽620的侧壁621被垂直于衬底基板100的平面(如XZ面)所截的图案可以为直线，也可以为曲线。
本公开实施例的一示例，通过将平坦层内凹槽侧壁倾斜设置，有利于增加整面出光效率。
图16至图17B为根据本公开实施例的不同示例提供的显示基板的局部平面结构示意图。图16至图17B所示示例中的显示基板与图6所示示例中的显示基板的不同之处在于图16至图17B所示显示基板中的限定部320包括开孔325。例如，发光元件的第二电极可以通过多个开孔325与电极搭接部520电连接。图16至图17B所示示例中的显示基板的不同之处在于发光元件的发光区的形状不同。图16至图17B所示示例中的显示基板中的衬底基板、限定部以及发光元件等特征可与上述示例中的显示基板中的衬底基板、限定部以及发光元件等特征相同，在此不再赘述。
例如，如图16至图17B所示，可以仅在与开孔325对应位置设置电极搭接部520，也可以设置延伸方向与限定部320延伸方向相同的电极搭接部520。
本公开实施例提供的显示基板中，通过采用在限定部中设置多个开孔的方式，可以在提高第二电极与电极搭接部电连接效果的同时，尽量避免第二电极与电极搭接部连接位置处与第一电极短路或者漏电的问题的发生。
例如，至少部分开孔325中，第二电极220与电极搭接部520的部分的中心与开孔325的中心不重合。例如，至少部分开孔325中，第二电极220与电极搭接部520的部分的面积小于开孔325在电极搭接部520上的正投影的面积。
例如，如图16所示，沿行方向排列的开孔325可以等间距排列，且沿行方向排列的开孔325位于同一直线；沿列方向排列的开孔325也可以等间距排列，沿列方向排列的开孔325可以位于同一直线。
例如，沿行方向排列的开孔325之间的间距与沿列方向排列的开孔325之间的间距可以相同。
例如，部分开孔325可以为盲孔，即开孔325中的发光功能层不去除，第二电极不在盲孔位置与电极搭接部搭接。通过设置盲孔有利于提高工艺效率。
在一些示例中，如图16至图17A所示，相邻不同颜色发光元件200的发光区之间的间隔和相邻相同颜色发光元件200之间的间隔中尺寸最大的间隔与 开孔325交叠。
例如，如图16至图17A所示，彼此相邻的第一发光元件201所在列与第三发光元件203所在列存在发光区之间的尺寸最大的间隔204，该间隔204处设置有开孔325，有利于避免第二电极与电极搭接部连接位置处与第一电极短路或者漏电的问题的发生。
上述“所在列”指沿Y方向排列的多个第一发光元件为一列，沿Y方向排列的多个第二发光元件为一列，沿Y方向排列的多个第三发光元件为一列。
当然，本公开实施例不限于此，例如，如图17A所示，第三发光元件203所在列与第二发光元件202所在列之间的尺寸最大的间隔205位置处也可以设置开孔325。例如，间隔205的最大尺寸小于间隔204的最大尺寸。
例如，如图16至图17A所示，相邻不同颜色发光元件之间可以设置开孔325。例如，相邻相同颜色发光元件之间也可以设置开孔325。例如，相邻相同颜色发光元件的发光区之间间隔尺寸最大位置处可以设置开孔325。例如，相邻不同颜色发光元件的发光区之间间隔尺寸最小位置处可以设置开孔325。
例如，如图17B所示，第一发光元件201可以为红色发光元件，第二发光元件202可以为绿色发光元件，第三发光元件203可以为蓝色发光元件。例如，绿色发光元件202的发光区的形状可以为六边形或者八边形。例如，绿色发光元件202的发光区的形状可以为轴对称图形，如对称轴沿Y方向延伸。例如，蓝色发光元件203和红色发光元件201至少之一的发光区的形状可以为八边形，如蓝色发光元件203和红色发光元件201至少之一的发光区在Y方向上可以为非对称图形。例如，多个发光元件200可以排列为两个子发光元件行，一个子发光元件行包括沿行方向(如X方向)交替排列的红色发光元件201和蓝色发光元件203，另一个子发光元件行包括沿行方向排列的绿色发光元件202，在行方向上，相邻两个绿色发光元件202的发光区之间的距离大于相邻蓝色发光元件203和红色发光元件201的发光区之间的距离，开孔325设置在行方向上相邻两个绿色发光元件202的发光区之间。例如，在列方向(如Y方向)排列的相邻红色发光元件201的发光区之间的距离和在列方向排列的相邻蓝色发光元件203的发光区之间的距离的至少之一大于在在列方向排列的相邻绿色发光元件202的发光区之间的距离，开孔325可以设置在列方向排列的相邻红色发光元件201的发光区之间。
图18为根据本公开实施例的另一示例中沿图1A所示AA’线所截的局部截 面结构示意图。图18所示示例中的显示基板与图2所示示例中的显示基板的区别在于：显示基板还包括隔垫物(PS)340，位于限定部320中的至少部分远离衬底基板100一侧的表面。
例如，隔垫物340位于限定部320与第二电极220之间。例如，隔垫物340被配置为支撑制作发光功能层的蒸镀掩模板。
例如，隔垫物340在衬底基板100上的正投影完全位于限定部320在衬底基板100上的正投影内。
例如，如图18所示，光转换层240远离衬底基板100一侧表面比限定部320远离衬底基板100一侧表面更远离衬底基板100。例如，光转换层240远离衬底基板100一侧表面比隔垫物340远离衬底基板100一侧的表面更靠近衬底基板100。
通过在限定部远离衬底基板一侧表面设置隔垫物，可以采用隔垫物形成的开口限定光转换层，将像素限定图案的限定部的最大厚度设置的小于光转换层的厚度，有利于提高第二电极的连续性。
例如，像素限定图案中第一子限定部的最大厚度和第二子限定部的最大厚度基本相同。例如，仅第一子限定部321以及环状限定部323远离衬底基板100一侧表面设置有隔垫物340，第二子限定部322远离衬底基板100一侧表面没有设置隔垫物340。
例如，限定部320中未设置隔垫物340的位置可以设置图6所示示例中的开槽，如第一子限定部321未设置隔垫物340的位置可以设置开槽以使第二电极220与电极搭接部电连接。
例如，隔垫物340沿平行于衬底基板100的方向上的尺寸小于限定部320沿该方向上的尺寸，有利于提高形成在限定部以及隔垫物上的第二电极的连续性。
图19为根据本公开实施例的另一示例中沿图1A所示AA’线所截的局部截面结构示意图。图19所示示例中的显示基板与图2所示示例中的显示基板的区别在于：限定部320包括层叠设置的第一限定部3201和第二限定部3202，第一限定部3201位于第二限定部3202靠近衬底基板100的一侧，光转换层240靠近衬底基板100的表面比与第二限定部3202的至少部分远离衬底基板100的表面更靠近衬底基板100。本示例提供的显示基板中的发光元件、衬底基板、第一绝缘层等结构可以与图2至图17A所示任意示例中的显示基板中的发光元 件、衬底基板以及第一绝缘层等结构具有相同的特征，在此不再赘述。
例如，如图19所示，第一限定部3201远离衬底基板100一侧表面比光转换层240远离衬底基板100一侧表面更靠近衬底基板100，第二限定部3202远离衬底基板100一侧表面比光转换层240远离衬底基板100一侧表面更远离衬底基板100，第一限定部3201限定的开口311可以用于限定发光功能层230，第二限定部3202限定的开口312可以用于限定光转换层240。
本示例提供的显示基板通过将限定部设置为层叠设置的第一限定部和第二限定部，有利于提高限定部整体的厚度以形成用于限定光转换层的开口区域，有利于光转换层厚度的灵活设置。
例如，第一限定部3201限定的开口311在衬底基板100上的正投影的最大尺寸可以小于第二限定部3202限定的开口312在衬底基板100上的正投影的最大尺寸。当然，本公开实施例不限于此，开口311在衬底基板100上的正投影的最大尺寸也可以大于或者等于开口312在衬底基板100上的正投影的最大尺寸。
例如，如图19所示，在垂直于衬底基板100的方向上，第一限定部3201的最大尺寸可以大于第二限定部3202的最大尺寸。
在一些示例中，如图19所示，第一限定部3201与第二限定部3202之间设置有第一绝缘层400。例如，第一限定部3201与第二限定部3202之间还设置有第二电极220。例如，第一限定部3201与第二限定部3202之间还设置有发光功能层230。
本示例通过将限定部设置为层叠设置的第一限定部和第二限定部，且第一限定部和第二限定部之间设置有第一绝缘层，如封装层，可以在限定部整体厚度较大以形成限定光转换层的开口的同时，将第一限定部的厚度设置的较小，以提高形成在第一限定部上的第二电极的连续性。
例如，图19示意性的示出第一限定部3201的厚度大于第二限定部3202的厚度，但不限于此，第一限定部的厚度可以小于第二限定部的厚度以进一步提高形成在第一限定部上的第二电极的连续性。
例如，如图19所示限定部可以包括图2至图3所示示例中厚度不同的第一子限定部和第二子限定部，或者包括图5所示示例中的第一子限定部和第二子限定部，或者包括图6所示开槽以及与开槽相对设置的电极搭接部，或者包括图16所示开孔以及与开孔相对设置的电极搭接部，或者包括图18所示隔垫 物，本示例对此不作限制。
例如，图19所示显示基板中的平坦层远离衬底基板一侧表面可以为平坦的表面，或者包括图12至图15任一项所示平坦层中的凹槽，或者包括图11所示平坦层凸出部。
图20为根据本公开实施例的另一示例中沿图1A所示AA’线所截的局部截面结构示意图。图20所示示例中的显示基板与图19所示示例中的显示基板的区别在于第一限定部3201与第二限定部3202直接接触。本示例提供的显示基板中的发光元件、衬底基板、第一绝缘层等结构可以与图2至图17A所示任意示例中的显示基板中的发光元件、衬底基板以及第一绝缘层等结构具有相同的特征，在此不再赘述。
在一些示例中，如图20所示，限定部320包括层叠设置的至少两层结构。图20示意性的示出限定部320包括两层结构，但不限于此，限定部还可以包括三层或者更多层层叠设置的结构。例如，限定部包括的多层结构中的任意相邻两层直接接触，或者限定部包括的多层结构中最远离衬底基板的一层结构位于第一绝缘层远离衬底基板的一侧，或者限定部包括的多层结构中的至少两层结构位于第一绝缘层远离衬底基板的一侧。
例如，如图20所示，第一绝缘层400位于第二限定部3202远离第一限定部3201的一侧。例如，第二电极220位于第二限定部3202远离第一限定部3201的一侧。
例如，如图20所示，沿垂直于衬底基板100的方向，第一限定部3201的最大尺寸可以大于第二限定部3202的最大尺寸，但不限于此，沿垂直于衬底基板的方向，第一限定部的尺寸也可以小于或者等于第二限定部的最大尺寸。
例如，如图20所示，第二限定部3202远离衬底基板100的一侧表面形成的斜坡的坡度角可以小于第一限定部3201远离衬底基板100的一侧表面形成的斜坡的坡度角，以提高形成在第二限定部上的第二电极的连续性。
例如，图20所示层叠设置的第一限定部可以包括图11所示的开槽，第二限定部可以与开槽没有交叠，如同一第一限定部可以包括两条开槽以形成三个部分，位于中间的部分的第一限定部上设置有第二限定部，位于两侧部分的第一限定部上没有第二限定部以使得第二限定部可以暴露开槽。
例如，如图20所示，第一限定部3201和第二限定部3202被垂直于衬底基板100的平面，如XZ面所截的截面形状可以相同，如均为梯形，且梯形远 离衬底基板100一侧的底为上底，梯形靠近衬底基板100一侧的底为下底，下底的长度大于上底的长度。但本公开实施例不限于此，第一限定部和第二限定部被垂直于衬底基板的平面所截的截面的形状可以不同，如第一限定部和第二限定部之一的截面形状为梯形，另一个的截面形状为矩形；如第一限定部的形状为阶梯型，第二限定部的形状为梯形、矩形、三角形、弧形等，本公开实施例对第一限定部和第二限定部的截面形状不作限定。
例如，第二限定部3202被垂直于衬底基板100的平面所截的截面可以为梯形，且梯形斜边与下底之间的角度较小，如不大于45度，有利于增加限定发光功能层的最大开口与限定光转换层的最大开口的比例。
例如，上述第一限定部3201和第二限定部3202的材料可以相同，也可以不同。
例如，上述第一限定部3201与第二限定部3202彼此接触的两个表面中，第一限定部3201的表面沿平行于衬底基板100的方向的最大尺寸可以小于第二限定部3202的表面沿平行于衬底基板100方向的最大尺寸以形成底切结构。
图21为根据本公开实施例的另一示例中沿图1A所示AA’线所截的局部截面结构示意图。图21所示示例中的显示基板与图2所示示例中的显示基板的区别在于显示基板还包括隔离结构350，位于第二电极220与限定部320之间。本示例提供的显示基板中的发光元件、衬底基板、第一绝缘层等结构可以与图2至图17A所示任意示例中的发光元件、衬底基板以及第一绝缘层等结构具有相同的特征，在此不再赘述。
在一些示例中，如图21所示，沿垂直于衬底基板100的方向，隔离结构350与限定部320交叠，且隔离结构350与限定部320的材料不同，沿相邻发光元件的排列方向，位于该相邻发光元件之间的隔离结构350中隔离结构350的边缘相对于限定部320的边缘突出以形成突出部。
例如，隔离结构350的材料包括无机非金属材料。例如，隔离结构350的材料包括氮化硅、氧化硅或者氮氧化硅中的任意一种或多种。
例如，可以通过对隔离结构350的形状进行设置以使得发光功能层230在突出部处断开，第二电极220在突出部处连续设置。例如，隔离结构350与限定部320的厚度和与发光功能层230的厚度之比为0.7～1.5。例如，隔离结构350的至少部分侧表面与平行于衬底基板100的平面的坡度角大于60度。例如，沿平行于衬底基板100的方向，突出部的尺寸不小于0.01微米。例如，隔离结 构350远离衬底基板100一侧表面为向衬底基板100一侧弯曲的弯曲表面。
例如，如图21所示，光转换层240远离衬底基板100一侧表面比限定部320远离衬底基板100一侧表面更远离衬底基板100。例如，光转换层240远离衬底基板100一侧表面比隔离结构350远离衬底基板100一侧的表面更靠近衬底基板100。
通过在限定部远离衬底基板一侧表面设置隔离结构，可以隔离结构形成的开口区域限定光转换层，将像素限定图案的限定部的最大厚度设置的小于光转换层的厚度，有利于提高第二电极的连续性。
例如，像素限定图案中第一子限定部的最大厚度和第二子限定部的最大厚度基本相同。例如，仅第一子限定部321以及环状限定部323远离衬底基板100一侧表面设置有隔离结构350，第二子限定部322远离衬底基板100一侧表面没有设置隔离结构350。
例如，限定部320和隔离结构350中可以设置图6所示的开槽324以使第二电极220与电极搭接部电连接。
例如，隔离结构350沿平行于衬底基板100的方向上的尺寸小于限定部320沿该方向上的尺寸，有利于提高形成在限定部以及隔垫物上的第二电极的连续性。
图22至图26为不同示例提供的显示基板中的限定部的局部截面结构示意图。例如，如图22至图26所示，限定部320可以为一层结构。当然本公开实施例不限于此，限定部还可以包括形成图22至图26任一形状的多层层叠设置的结构。
在一些示例中，如图22至图26所示，限定部320被位于其两侧的相邻两个发光元件200的发光区中心连线所在平面所截的截面为限定部截面3200，限定部截面3200的形状包括梯形或者阶梯状，平面垂直于衬底基板100。例如，该平面可以为XZ面。
例如，如图22所示，限定部截面3200的形状可以为梯形，梯形的上底比下底更靠近衬底基板100，如倒梯形。例如，限定部320远离衬底基板100一侧的表面在X方向上的尺寸大于限定部320靠近衬底基板100一侧的表面在X方向上的尺寸。通过将限定部截面的形状形成为倒梯形，可以使得限定发光功能层的最大开口的尺寸大于限定光转换层的最大开口的尺寸，避免不同颜色光串色。例如，为了进一步避免串色，还可以在限定部侧表面或者内部设置反射 层或者反射粒子。
例如，如图23所示，限定部截面3200的形状可以为阶梯状。通过将限定部截面的形状形成为阶梯状，可以使得限定发光功能层的最大开口的尺寸小于限定光转换层的最大开口的尺寸，可以让发光元件发出的光最大范围的入射到光转换层。
例如，如图24所示，限定部截面3200的形状可以为梯形，梯形的上底比下底更远离衬底基板100。例如，限定部320远离衬底基板100一侧的表面在X方向上的尺寸小于限定部320靠近衬底基板100一侧的表面在X方向上的尺寸。
例如，如图24所示，限定不同发光元件200的发光区的限定部320的限定部截面3200的形状不同，如限定第三发光元件203的限定部截面3200朝向第三发光元件203的发光区的斜边与平行于衬底基板100的平面之间的夹角小于该限定部截面3200远离第三发光元件203的发光区的斜边与该平面之间的夹角，有利于调节不同颜色发光元件出光角度以及出光效率。
例如，第三发光元件203可以为蓝色发光元件，或者红色发光元件，或者绿色发光元件。
在一些示例中，如图25和图26所示，限定部320被位于其两侧的相邻两个发光元件200的发光区中心连线所在平面所截的截面为限定部截面3200，限定部截面3200的中间部分的平行于衬底基板100的方向的尺寸大于或者小于两侧部分的平行于衬底基板100的方向的尺寸，平面垂直于衬底基板100。例如，该平面可以为XZ面。
例如，如图25所示，限定部320的限定部截面3200可以为中间内凹的结构。
例如，如图26所示，限定部320的限定部截面3200可以为中间外凸的结构。
例如，如图22至图26所示任一种形状的限定部可以包括图2至图3所示示例中厚度不同的第一子限定部和第二子限定部，或者包括图5所示示例中的第一子限定部和第二子限定部，或者包括图6所示开槽以及与开槽相对设置的电极搭接部，或者包括图16所示开孔以及与开孔相对设置的电极搭接部，或者包括图18所示隔垫物，本示例对此不作限制。
例如，如图22至图26所示显示基板中的平坦层远离衬底基板一侧表面可 以为平坦的表面，或者包括图12至图15任一项所示平坦层中的凹槽，或者包括图11所示平坦层凸出部。
图27为根据本公开实施例的另一示例中沿图1A所示AA’线所截的局部截面结构示意图。图27所示示例中的显示基板与图2所示示例中的显示基板的区别在于显示基板还包括第二绝缘层710，位于光转换层240远离衬底基板100的一侧。
例如，第二绝缘层710可以为封装光转换层240的封装层。
在一些示例中，如图27所示，第二绝缘层710包括折射粒子711。例如，折射粒子711的材料可以包括氧化锆。
通过在光转换层的出光侧设置具有折射粒子的第二绝缘层，有利于提高出光效率。
图27所示显示基板中的像素限定图案、发光元件、衬底基板、第一绝缘层等结构可以与图2至图26任一示例中的像素限定图案、发光元件、衬底基板、第一绝缘层等结构具有相同的特征，在此不再赘述。
图28为根据本公开实施例的另一示例中沿图1A所示AA’线所截的局部截面结构示意图。图28所示示例中的显示基板与图27所示示例中的显示基板的区别在于显示基板还包括彩膜层720，位于第二绝缘层710远离光转换层240的一侧。
例如，如图28所示，彩膜层720包括位于发光区的部分以及位于相邻发光区的部分。例如，第一发光元件201可以为红色发光元件，彩膜层720中与第一发光元件201对应的彩膜可以为红色彩膜；第二发光元件202可以为绿色发光元件，彩膜层720中与第二发光元件202对应的彩膜可以为绿色彩膜；第三发光元件203可以为蓝色发光元件，彩膜层720中与第三发光元件203对应的材料可以为蓝色彩膜。
例如，相邻发光元件的发光区之间的限定部320上设置的彩膜层720可以层叠设置以起到滤光作用。例如，第一发光元件201的发光区和第二发光元件202的发光区之间的限定部320上设置有红色彩膜和绿色彩膜的叠层，第二发光元件202的发光区和第三发光元件203的发光区之间的限定部320上设置有绿色彩膜与蓝色彩膜的叠层。
例如，图28所示彩膜层可以采用COE(Color On Encapsulation)技术，通过在封装层上形成彩膜，以提升显示装置的对比度。
例如，如图28所示，第二绝缘层710在形成于光转换层240上以后，在与光转换层240对应位置形成凹槽，该凹槽与像素限定图案的开口正对，彩膜层720包括形成于凹槽内的部分。例如，彩膜层720靠近衬底基板100一侧表面可以为平坦的表面，彩膜层720远离衬底基板一侧的至少部分表面可以为向衬底基板100一侧凹陷的表面。
当然，本公开实施例不限于此，显示基板的显示侧可以设置盖板，上述彩膜层也可以设置在盖板面向显示基板的一侧。
图29为根据本公开另一实施例提供的显示基板。如图29所示，显示基板包括衬底基板100以及位于衬底基板100上的多个发光元件200和像素限定图案300。发光元件200包括发光功能层230以及沿垂直于衬底基板100的方向位于发光功能层230两侧的第一电极210和第二电极220，第一电极210位于发光功能层230与衬底基板100之间；像素限定图案300位于第一电极210远离衬底基板100一侧，像素限定图案300包括多个开口310以及围绕多个开口310的限定部320，发光元件200至少部分位于开口310中。至少一个发光元件200还包括光转换层240，光转换层240被配置为使得一种颜色光入射到光转换层后出射另一种颜色光，光转换层240位于第一电极210远离第二电极220的一侧。
本公开实施例提供的显示基板中，将光转换层设置在第一电极远离第二电极的一侧，可以尽量减少光转换层与发光功能层之间的距离，以提高光转换层对入射的光的转换效率。
例如，图29所示显示基板中的发光功能层230可以与图1A所示显示基板中的发光功能层230具有相同的特征，在此不再赘述。
例如，图29所示显示基板中，发光元件200的第一电极210为透光电极，第二电极220为反射电极。例如，发光功能层230发出的光被第二电极220反射向第一电极210远离第二电极220的一侧，以经过光转换层240后出射。
例如，图29所示显示基板中的限定部在垂直于衬底基板100的方向上的最大尺寸，如厚度，可以设置的较小，用于限定发光元件的发光功能层形成的区域，该显示基板中，通过将限定部的厚度设置的较小，有利于提高第二电极的连续性。
例如，如图29所示，光转换层240位于衬底基板100远离第一电极210的一侧。
例如，图29所示显示基板中的光转换层240和透光功能层250可以与图1A至图2所示显示基板中的光转换层230和透光功能层250具有相同的特征，在此不再赘述。
例如，如图29所示，衬底基板100远离第一电极210的一侧设置有分隔结构800，用于限定光转换层230以及透光功能层250的位置。
例如，如图29所示，分隔结构800在衬底基板100上的正投影与限定部320在衬底基板100上的正投影交叠。
例如，如图29所示，分隔结构800形成的开口区域用于形成光转换层240和透光功能层250。
例如，图29所示显示基板中的限定部320可以设置如图2至图3所示示例中包括厚度不同的第一子限定部和第二子限定部的限定部，或者设置如图5所示示例中的第一子限定部和第二子限定部，或者设置如图6所示开槽以及与开槽相对设置的电极搭接部，或者设置如图16所示开孔以及与开孔相对设置的电极搭接部。
例如，图29所示显示基板中可以包括如图10至图15所示的平坦层。
例如，如图29所示，光转换层240远离衬底基板100一侧设置衬底810。例如，光转换层240远离衬底基板100一侧表面可以为平坦表面，光转换层240靠近衬底基板100一侧表面可以为向远离衬底基板100一侧凹陷的表面。
例如，光转换层240与衬底810之间可以设置彩膜层。
例如，如图29所示，显示基板还包括位于第二电极220远离衬底基板100一侧的第一绝缘层400，该第一绝缘层400可以为封装层，封装层可以包括层叠设置的有机封装层以及无机封装层。
图30为根据本公开另一实施例提供的显示装置的局部截面结构示意图。如图30所示，显示装置包括上述任一示例中所示的显示基板10，图30示意性的示出显示装置包括图2所示的显示基板，但不限于此，还可以包括图4A至图29所示任一显示基板。如图30所示，显示装置还包括与显示基板10相对设置的对置基板20，对置基板20位于显示基板10的显示侧。
例如，如图30所示，发光元件发射的光从第二电极220远离衬底基板100一侧出射，对置基板20位于第二电极220远离衬底基板100的一侧。但不限于此，当发光元件发射的光从衬底基板远离第二电极一侧出射时，对置基板位于衬底基板远离第二电极的一侧。
在一些示例中，如图30所示，对置基板20面向显示基板10的一侧与光转换层240正对的位置处设置的材料层21包括与光转换层240中的材料相同的材料。
通过在对置基板设置与光转换层材料相同的材料层有利于降低对置基板的厚度，并且提高光转换效率。
例如，如图30所示，对置基板20可以包括盖板23，位于盖板21面向显示基板10一侧的分隔结构22，材料层21被分隔结构22形成的开口限定。
例如，显示装置还包括彩膜层(图中未示出)，彩膜层可以设置在材料层远离显示基板的一侧。
例如，本公开实施例提供的显示装置可以为有机发光二极管显示装置。
例如，该显示装置可以为具有屏下摄像头的手机、平板电脑、笔记本电脑、导航仪等任何具有显示功能的产品或者部件，本实施例不限于此。
有以下几点需要说明：
(1)本公开的实施例附图中，只涉及到与本公开实施例涉及到的结构，其他结构可参考通常设计。
(2)在不冲突的情况下，本公开的同一实施例及不同实施例中的特征可以相互组合。
以上所述仅是本公开的示范性实施方式，而非用于限制本公开的保护范围，本公开的保护范围由所附的权利要求确定。

Claims (36)

  1. 一种显示基板，包括：
    衬底基板；
    多个发光元件，位于所述衬底基板上，所述发光元件包括发光功能层以及沿垂直于所述衬底基板的方向位于所述发光功能层两侧的第一电极和第二电极，所述第一电极位于所述发光功能层与所述衬底基板之间；
    像素限定图案，位于所述第一电极远离所述衬底基板一侧，所述像素限定图案包括多个开口以及围绕所述多个开口的限定部，所述发光元件至少部分位于所述开口中，
    其中，至少一个发光元件还包括光转换层，所述光转换层被配置为使得一种颜色光入射到所述光转换层后出射另一种颜色光，所述光转换层位于所述第二电极远离所述衬底基板的一侧，且所述光转换层的至少部分位于所述开口内，所述光转换层中位于所述开口内的部分靠近所述衬底基板的表面比与所述限定部的至少部分远离所述衬底基板的表面更靠近所述衬底基板。
  2. 根据权利要求1所述的显示基板，其中，所述光转换层中位于所述开口内的部分远离所述衬底基板的表面比所述限定部的所述至少部分远离所述衬底基板的表面更靠近所述衬底基板。
  3. 根据权利要求1或2所述的显示基板，其中，所述光转换层中位于所述开口内的部分远离所述衬底基板的表面的中心部分比边缘部分更靠近所述衬底基板。
  4. 根据权利要求1-3任一项所述的显示基板，其中，所述光转换层包括量子点。
  5. 根据权利要求1-4任一项所述的显示基板，还包括：
    第一绝缘层，位于所述光转换层与所述第二电极之间，
    其中，所述第一绝缘层中位于所述开口内的部分的远离所述衬底基板的表面比所述限定部的所述至少部分远离所述衬底基板的表面更靠近所述衬底基板。
  6. 根据权利要求5所述的显示基板，其中，所述第一绝缘层的厚度小于所述限定部的所述至少部分的厚度。
  7. 根据权利要求5或6所述的显示基板，其中，所述第一绝缘层包括至 少两层膜层，且不同膜层的厚度差小于1微米。
  8. 根据权利要求1-7任一项所述的显示基板，其中，所述多个发光元件包括至少两种颜色的发光元件，位于相邻不同颜色的发光元件对应的开口之间的所述限定部包括第一子限定部，位于相邻且相同颜色的发光元件对应的开口之间的所述限定部包括第二子限定部，所述第一子限定部的最大厚度大于所述第二子限定部的最大厚度，和/或，所述第一子限定部远离所述衬底基板的一侧表面包括第一斜坡，所述第二子限定部远离所述衬底基板的一侧表面包括第二斜坡，所述第一斜坡的坡度角大于所述第二斜坡的坡度角；
    所述第二电极中覆盖所述第二子限定部的部分连续设置。
  9. 根据权利要求8所述的显示基板，还包括：
    信号传输线，位于所述第一电极面向所述衬底基板的一侧；
    传输部，位于所述第一电极面向所述衬底基板的一侧，且与所述信号传输线电连接，
    其中，所述显示基板包括显示区以及围绕所述显示区的周边区，所述信号传输线位于所述周边区，所述传输部位于所述限定部中最边缘的部分靠近所述显示区的一侧，且所述第二电极与所述传输部电连接。
  10. 根据权利要求8或9所述的显示基板，其中，沿第一方向排列的相邻的至少两个发光元件发光颜色相同，沿第二方向排列的相邻的至少两个发光元件的发光颜色不同，所述第一方向与所述第二方向相交；
    所述限定部包括多个第一子限定部和多个第二子限定部，至少一个第一子限定部沿所述第一方向延伸，且相邻两个第一子限定部之间设置有沿所述第二方向延伸的所述第二子限定部。
  11. 根据权利要求1-7任一项所述的显示基板，还包括：
    电极搭接部，位于所述限定部面向所述衬底基板的一侧，且沿垂直于所述衬底基板的方向，所述限定部与所述电极搭接部交叠，
    其中，所述限定部包括暴露所述电极搭接部的开孔或开槽，所述第二电极通过所述开孔或所述开槽与所述电极搭接部电连接。
  12. 根据权利要求11所述的显示基板，其中，发光颜色不同的发光元件之间的所述限定部的最大厚度与发光颜色相同的发光元件之间的所述限定部的最大厚度的比值为0.8～1。
  13. 根据权利要求12所述的显示基板，其中，至少部分所述电极搭接部 的延伸方向与至少部分所述限定部的延伸方向相同。
  14. 根据权利要求11-13任一项所述的显示基板，还包括：
    信号传输线，位于所述第一电极面向所述衬底基板的一侧，
    其中，所述显示基板包括显示区以及围绕所述显示区的周边区，所述信号传输线位于所述周边区，所述第二电极通过所述电极搭接部与所述信号传输线电连接。
  15. 根据权利要求11-14任一项所述的显示基板，其中，所述电极搭接部包括至少一层与所述第一电极同层设置的膜层。
  16. 根据权利要求15所述的显示基板，其中，所述电极搭接部包括多层膜层，且所述电极搭接部远离所述衬底基板一侧的表面与所述衬底基板之间的距离大于所述第一电极远离所述衬底基板一侧的表面与所述衬底基板之间的距离。
  17. 根据权利要求11-15任一项所述的显示基板，其中，所述电极搭接部包括位于所述第一电极远离所述衬底基板的一侧的膜层。
  18. 根据权利要求11-17任一项所述的显示基板，还包括：
    平坦层，位于所述第一电极与所述衬底基板之间，
    其中，所述平坦层包括平坦层凸出部，所述平坦层凸出部在所述衬底基板上的正投影与所述电极搭接部在所述衬底基板上的正投影交叠以使所述电极搭接部远离所述衬底基板一侧的表面与所述衬底基板之间的距离大于所述第一电极远离所述衬底基板一侧的表面与所述衬底基板之间的距离。
  19. 根据权利要求11-17任一项所述的显示基板，还包括：
    平坦层，位于所述第一电极与所述衬底基板之间，
    其中，所述平坦层包括凹槽，沿垂直于所述衬底基板的方向，所述限定部与所述凹槽没有交叠；
    至少部分发光元件的所述第一电极和所述发光功能层位于所述凹槽内，且所述发光功能层远离所述衬底基板一侧的表面的至少部分比所述电极搭接部远离所述衬底基板一侧的表面更靠近所述衬底基板。
  20. 根据权利要求19所述的显示基板，还包括：
    透明补偿结构，位于所述光转换层与所述凹槽底部之间。
  21. 根据权利要求19或20所述的显示基板，其中，所述凹槽的侧壁倾斜设置，且所述侧壁中远离所述衬底基板的部分比靠近所述衬底基板的部分更远 离所述凹槽内设置的所述发光元件的发光区的中心。
  22. 根据权利要求11所述的显示基板，其中，所述限定部包括所述开孔，所述多个发光元件包括至少两种不同颜色发光元件，相邻不同颜色发光元件的发光区之间的间隔和相邻相同颜色发光元件之间的间隔中至少尺寸最大的间隔处设置有所述开孔。
  23. 根据权利要求1-4任一项所述的显示基板，还包括：
    隔离结构，位于所述第二电极与所述限定部之间，
    其中，沿垂直于所述衬底基板的方向，所述隔离结构与所述限定部交叠，且所述隔离结构与所述限定部的材料不同；
    沿相邻发光元件的排列方向，位于该相邻发光元件之间的所述隔离结构中所述隔离结构的边缘相对于所述限定部的边缘突出以形成突出部。
  24. 根据权利要求1-22任一项所述的显示基板，还包括：
    隔垫物，位于所述限定部中的至少部分远离所述衬底基板一侧的表面。
  25. 根据权利要求1-4任一项所述的显示基板，其中，所述限定部包括层叠设置的第一限定部和第二限定部，所述第一限定部位于所述第二限定部靠近所述衬底基板的一侧，所述光转换层靠近所述衬底基板的表面比与所述第二限定部的至少部分远离所述衬底基板的表面更靠近所述衬底基板。
  26. 根据权利要求25所述的显示基板，其中，所述第一限定部与所述第二限定部直接接触；或者，
    所述显示基板还包括第一绝缘层，位于所述光转换层与所述第二电极之间，其中，所述第一限定部与所述第二限定部之间设置有所述第一绝缘层。
  27. 根据权利要求1所述的显示基板，其中，所述限定部被位于其两侧的相邻两个发光元件的发光区中心连线所在平面所截的截面为限定部截面，所述限定部截面的形状包括梯形或者阶梯状，所述平面垂直于所述衬底基板。
  28. 根据权利要求1所述的显示基板，其中，所述限定部被位于其两侧的相邻两个发光元件的发光区中心连线所在平面所截的截面为限定部截面，所述限定部截面的中间部分的平行于所述衬底基板的方向的尺寸大于或者小于两侧部分的平行于所述衬底基板的方向的尺寸，所述平面垂直于所述衬底基板。
  29. 根据权利要求1所述的显示基板，其中，所述限定部包括层叠设置的至少两层结构。
  30. 根据权利要求1所述的显示基板，其中，所述发光功能层包括热活化 延迟荧光材料。
  31. 根据权利要求30所述的显示基板，其中，所述多个发光元件包括至少两种颜色的发光元件，所述至少两种颜色的发光元件的所述发光功能层被配置为均发出第一颜色光，所述至少两种颜色的发光元件中的至少一种颜色发光元件包括所述光转换层，且所述第一颜色光经过所述光转换层后转换为第二颜色光。
  32. 根据权利要求1-31任一项所述的显示基板，还包括：
    第二绝缘层，位于所述光转换层远离所述衬底基板的一侧；
    彩膜层，位于所述第二绝缘层远离所述光转换层的一侧。
  33. 根据权利要求32所述的显示基板，其中，所述第二绝缘层包括折射粒子。
  34. 一种显示基板，包括：
    衬底基板；
    多个发光元件，位于所述衬底基板上，所述发光元件包括发光功能层以及沿垂直于所述衬底基板的方向位于所述发光功能层两侧的第一电极和第二电极，所述第一电极位于所述发光功能层与所述衬底基板之间；
    像素限定图案，位于所述第一电极远离所述衬底基板一侧，所述像素限定图案包括多个开口以及围绕所述多个开口的限定部，所述发光元件至少部分位于所述开口中，
    其中，至少一个发光元件还包括光转换层，所述光转换层被配置为使得一种颜色光入射到所述光转换层后出射另一种颜色光，所述光转换层位于所述第一电极远离所述第二电极的一侧。
  35. 一种显示装置，包括权利要求1-34任一项所述的显示基板以及与所述显示基板相对设置的对置基板，其中，所述对置基板位于所述显示基板的显示侧。
  36. 根据权利要求35所述的显示装置，其中，所述对置基板面向所述显示基板的一侧与所述光转换层正对的位置处设置的材料层包括与所述光转换层中的材料相同的材料。
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